Gatta and Luzzu
Kami of Whispered Hopes
Walking Ballista

   Prerequisites

What do I need to start this combo?
Gatta and Luzzu in hand.
Kami of Whispered Hopes and Walking Ballista on the battlefield (Walking Ballista with two or more +1/+1 counters on it on the battlefield).
2 available

   Steps

How does this combo work?
1
Cast Gatta and Luzzu by paying 2.
2
When Gatta and Luzzu enters the battlefield, it triggers, targeting Walking Ballista.
3
Activate Walking Ballista by removing a +1/+1 counter from it, targeting itself, but instead putting two +1/+1 counters on it due to Gatta and Luzzu and Kami of Whispered Hopes.
4
Activate Walking Ballista by removing a +1/+1 counter from it, dealing 1 damage to any target.
5
Repeat from step 3.

   Results

What do I get from this combo?
Infinite damage
Infinite +1/+1 counters on a creature
Tidus, Yuna's Guardian
21%inclusion2.10K decks10.1K decks
Yuna, Grand Summoner
18%inclusion939 decks5.25K decks
Shalai and Hallar
1.3%inclusion42 decks3.31K decks
Ms. Bumbleflower
0.2%inclusion29 decks12.5K decks
Dyadrine, Synthesis Amalgam
1.7%inclusion24 decks1.40K decks
Atraxa, Praetors' Voice
0.1%inclusion18 decks14.4K decks
Wakka, Devoted Guardian
10%inclusion18 decks183 decks
Black Panther, Wakandan King
0.8%inclusion14 decks1.85K decks
Sovereign Okinec Ahau
0.8%inclusion13 decks1.56K decks
Hamza, Guardian of Arashin
0.6%inclusion12 decks1.90K decks
Miles Morales
0.4%inclusion12 decks2.87K decks
Falco Spara, Pactweaver
0.7%inclusion12 decks1.61K decks
Lae'zel, Vlaakith's Champion // Master Chef
1.0%inclusion9 decks929 decks
Marath, Will of the Wild
0.7%inclusion9 decks1.21K decks
Galadriel, Light of Valinor
0.1%inclusion7 decks5.50K decks
Bright-Palm, Soul Awakener
0.6%inclusion7 decks1.14K decks
Helga, Skittish Seer
0.1%inclusion6 decks6.71K decks
Ishai, Ojutai Dragonspeaker // Reyhan, Last of the Abzan
0.8%inclusion6 decks739 decks
New Cards
Abandoned Air Temple
13%inclusion101 decks791 decks
8%synergy
Beifong's Bounty Hunters
13%inclusion1 decks8 decks
11%synergy
Redirect Lightning
4.4%inclusion3 decks68 decks
0%synergy
Toph, Hardheaded Teacher
3.8%inclusion1 decks26 decks
-4%synergy
Wan Shi Tong, Librarian
3.7%inclusion31 decks840 decks
-1%synergy
High Synergy Cards
Sphere Grid
90%inclusion3.02K decks3.36K decks
87%synergy
Hardened Scales
96%inclusion3.24K decks3.36K decks
86%synergy
Damning Verdict
88%inclusion2.96K decks3.36K decks
86%synergy
Rikku, Resourceful Guardian
84%inclusion2.62K decks3.13K decks
83%synergy
Incubation Druid
84%inclusion2.82K decks3.36K decks
79%synergy
Maester Seymour
79%inclusion2.64K decks3.36K decks
77%synergy
Gyre Sage
81%inclusion2.71K decks3.36K decks
77%synergy
Fathom Mage
80%inclusion2.50K decks3.13K decks
76%synergy
Wakka, Devoted Guardian
77%inclusion2.60K decks3.36K decks
75%synergy
Inspiring Call
82%inclusion2.77K decks3.36K decks
74%synergy
Top Cards
Path to Exile
83%inclusion2.78K decks3.36K decks
36%synergy
Farseek
78%inclusion2.62K decks3.36K decks
42%synergy
Three Visits
77%inclusion2.58K decks3.36K decks
52%synergy
Forgotten Ancient
74%inclusion2.50K decks3.36K decks
68%synergy
An Offer You Can't Refuse
73%inclusion2.29K decks3.13K decks
49%synergy
Lulu, Stern Guardian
73%inclusion2.28K decks3.13K decks
71%synergy
Protection Magic
70%inclusion2.34K decks3.36K decks
69%synergy
Luminous Broodmoth
69%inclusion2.32K decks3.36K decks
67%synergy
Tromell, Seymour's Butler
68%inclusion2.28K decks3.36K decks
67%synergy
Chocobo Knights
68%inclusion2.28K decks3.36K decks
67%synergy
Game Changers
Rhystic Study
26%inclusion802 decks3.13K decks
1%synergy
Cyclonic Rift
22%inclusion693 decks3.13K decks
-1%synergy
Demonic Tutor
19%inclusion9 decks47 decks
-1%synergy
Teferi's Protection
15%inclusion492 decks3.36K decks
-2%synergy
Enlightened Tutor
14%inclusion486 decks3.36K decks
-1%synergy
Worldly Tutor
14%inclusion476 decks3.36K decks
2%synergy
Fierce Guardianship
13%inclusion402 decks3.13K decks
-5%synergy
Vampiric Tutor
13%inclusion6 decks47 decks
-3%synergy
Jeska's Will
8.7%inclusion8 decks92 decks
-7%synergy
The One Ring
5.0%inclusion169 decks3.36K decks
-4%synergy
Creatures
Shelinda, Yevon Acolyte
68%inclusion2.28K decks3.36K decks
66%synergy
Yuna, Grand Summoner
64%inclusion2K decks3.13K decks
60%synergy
Duskshell Crawler
63%inclusion2.11K decks3.36K decks
61%synergy
O'aka, Traveling Merchant
61%inclusion1.91K decks3.13K decks
59%synergy
Grateful Apparition
60%inclusion2.03K decks3.36K decks
58%synergy
Kimahri, Valiant Guardian
60%inclusion1.86K decks3.13K decks
58%synergy
Auron, Venerated Guardian
56%inclusion1.90K decks3.36K decks
56%synergy
Kutzil, Malamet Exemplar
56%inclusion1.88K decks3.36K decks
41%synergy
Herald of Secret Streams
54%inclusion1.70K decks3.13K decks
51%synergy
Corpsejack Menace
53%inclusion25 decks47 decks
48%synergy
Tekuthal, Inquiry Dominus
49%inclusion1.53K decks3.13K decks
47%synergy
Summon: Yojimbo
47%inclusion1.59K decks3.36K decks
45%synergy
Halana and Alena, Partners
46%inclusion42 decks92 decks
42%synergy
The Red Terror
42%inclusion39 decks92 decks
42%synergy
Arwen, Mortal Queen
41%inclusion1.39K decks3.36K decks
40%synergy
Sin, Unending Cataclysm
41%inclusion1.30K decks3.13K decks
39%synergy
Dreamtide Whale
41%inclusion1.29K decks3.13K decks
39%synergy
Summon: Ixion
39%inclusion1.32K decks3.36K decks
38%synergy
Thrummingbird
34%inclusion1.07K decks3.13K decks
31%synergy
Winding Constrictor
34%inclusion16 decks47 decks
30%synergy
Kodama of the West Tree
33%inclusion1.09K decks3.36K decks
29%synergy
Danny Pink
32%inclusion989 decks3.13K decks
30%synergy
Shalai and Hallar
30%inclusion28 decks92 decks
27%synergy
Birds of Paradise
30%inclusion1.01K decks3.36K decks
2%synergy
Summon: Valefor
30%inclusion937 decks3.13K decks
29%synergy
Evolution Sage
30%inclusion997 decks3.36K decks
24%synergy
Evolution Witness
29%inclusion977 decks3.36K decks
26%synergy
Tidus, Yuna's Guardian
28%inclusion863 decks3.13K decks
26%synergy
Ouroboroid
27%inclusion697 decks2.57K decks
24%synergy
Scholar of New Horizons
25%inclusion834 decks3.36K decks
24%synergy
Bane of Progress
25%inclusion830 decks3.36K decks
22%synergy
Pollywog Prodigy
24%inclusion754 decks3.13K decks
21%synergy
Champion of Lambholt
24%inclusion799 decks3.36K decks
18%synergy
Falco Spara, Pactweaver
23%inclusion736 decks3.13K decks
22%synergy
Chasm Skulker
23%inclusion726 decks3.13K decks
19%synergy
War Elemental
23%inclusion21 decks92 decks
23%synergy
Esper Sentinel
21%inclusion715 decks3.36K decks
2%synergy
Bristly Bill, Spine Sower
21%inclusion702 decks3.36K decks
17%synergy
Zimone, Paradox Sculptor
21%inclusion654 decks3.13K decks
19%synergy
Bright-Palm, Soul Awakener
21%inclusion19 decks92 decks
20%synergy
Summon: Magus Sisters
20%inclusion684 decks3.36K decks
19%synergy
Warden of the Grove
19%inclusion649 decks3.36K decks
17%synergy
Noble Hierarch
18%inclusion577 decks3.13K decks
3%synergy
Reluctant Role Model
18%inclusion614 decks3.36K decks
17%synergy
Rampant Rejuvenator
18%inclusion612 decks3.36K decks
17%synergy
Sunscorch Regent
18%inclusion594 decks3.36K decks
16%synergy
Denry Klin, Editor in Chief
18%inclusion554 decks3.13K decks
17%synergy
Reyhan, Last of the Abzan
17%inclusion8 decks47 decks
16%synergy
Jenova, Ancient Calamity
15%inclusion7 decks47 decks
13%synergy
Aragorn, Hornburg Hero
14%inclusion13 decks92 decks
12%synergy
Instants
Swords to Plowshares
56%inclusion1.88K decks3.36K decks
-6%synergy
Heroic Intervention
39%inclusion1.31K decks3.36K decks
9%synergy
Ripples of Potential
38%inclusion1.20K decks3.13K decks
36%synergy
Counterspell
38%inclusion1.18K decks3.13K decks
-4%synergy
Destroy Evil
28%inclusion925 decks3.36K decks
27%synergy
Yuna's Whistle
26%inclusion876 decks3.36K decks
26%synergy
Assassin's Trophy
26%inclusion12 decks47 decks
-5%synergy
Endless Detour
21%inclusion658 decks3.13K decks
19%synergy
Mutational Advantage
21%inclusion646 decks3.13K decks
17%synergy
Boros Charm
18%inclusion17 decks92 decks
-4%synergy
Revitalizing Repast
17%inclusion8 decks47 decks
9%synergy
Anguished Unmaking
17%inclusion8 decks47 decks
-7%synergy
Dovin's Veto
15%inclusion483 decks3.13K decks
-3%synergy
Deflecting Swat
15%inclusion14 decks92 decks
-1%synergy
Abzan Charm
15%inclusion7 decks47 decks
11%synergy
Beast Within
14%inclusion463 decks3.36K decks
-21%synergy
Swan Song
13%inclusion412 decks3.13K decks
-4%synergy
Deadly Rollick
13%inclusion6 decks47 decks
-1%synergy
Eladamri's Call
13%inclusion427 decks3.36K decks
4%synergy
Red Elemental Blast
11%inclusion10 decks92 decks
5%synergy
Generous Gift
10%inclusion335 decks3.36K decks
-13%synergy
Pull from Tomorrow
10%inclusion308 decks3.13K decks
7%synergy
Mana Drain
9.4%inclusion294 decks3.13K decks
-5%synergy
Gift of the Viper
8.8%inclusion296 decks3.36K decks
7%synergy
Chaos Warp
8.7%inclusion8 decks92 decks
-22%synergy
Atomize
8.5%inclusion4 decks47 decks
5%synergy
Putrefy
8.5%inclusion4 decks47 decks
-7%synergy
Arcane Denial
8.3%inclusion261 decks3.13K decks
-12%synergy
Strength of Will
7.1%inclusion122 decks1.71K decks
5%synergy
Stroke of Midnight
7.1%inclusion237 decks3.36K decks
-3%synergy
Vraska's Fall
6.4%inclusion3 decks47 decks
5%synergy
Entomb
6.4%inclusion3 decks47 decks
-1%synergy
Withering Torment
6.4%inclusion3 decks47 decks
-2%synergy
Fell the Profane
6.4%inclusion3 decks47 decks
-2%synergy
Dark Ritual
6.4%inclusion3 decks47 decks
-18%synergy
Contractual Safeguard
5.9%inclusion199 decks3.36K decks
6%synergy
Flawless Maneuver
5.7%inclusion193 decks3.36K decks
-5%synergy
Negate
5.6%inclusion175 decks3.13K decks
-16%synergy
Akroma's Will
5.4%inclusion183 decks3.36K decks
-4%synergy
Tibalt's Trickery
5.4%inclusion5 decks92 decks
1%synergy
Pyroblast
5.4%inclusion5 decks92 decks
0%synergy
Thrill of Possibility
5.4%inclusion5 decks92 decks
-4%synergy
Double Trouble
5.1%inclusion4 decks79 decks
5%synergy
Sorceries
Farewell
66%inclusion2.21K decks3.36K decks
53%synergy
Collective Effort
41%inclusion1.38K decks3.36K decks
40%synergy
Wave Goodbye
31%inclusion969 decks3.13K decks
29%synergy
Yuna's Decision
29%inclusion990 decks3.36K decks
29%synergy
Cultivate
23%inclusion783 decks3.36K decks
-20%synergy
Nature's Lore
23%inclusion760 decks3.36K decks
-9%synergy
Promise of Loyalty
22%inclusion749 decks3.36K decks
19%synergy
Blasphemous Act
22%inclusion20 decks92 decks
-11%synergy
Rampant Growth
14%inclusion465 decks3.36K decks
-20%synergy
Reanimate
13%inclusion6 decks47 decks
-6%synergy
Requisition Raid
12%inclusion412 decks3.36K decks
10%synergy
Damn
11%inclusion5 decks47 decks
-5%synergy
Diabolic Intent
8.5%inclusion4 decks47 decks
1%synergy
Kodama's Reach
8.0%inclusion269 decks3.36K decks
-20%synergy
Tezzeret's Gambit
7.3%inclusion228 decks3.13K decks
4%synergy
Combat Tutorial
7.0%inclusion214 decks3.05K decks
6%synergy
Painful Truths
6.4%inclusion3 decks47 decks
4%synergy
Buried Alive
6.4%inclusion3 decks47 decks
0%synergy
Culling Ritual
6.4%inclusion3 decks47 decks
-5%synergy
Toxic Deluge
6.4%inclusion3 decks47 decks
-12%synergy
Idyllic Tutor
6.2%inclusion207 decks3.36K decks
2%synergy
Utility Artifacts
Blitzball Stadium
55%inclusion1.72K decks3.13K decks
54%synergy
The Ozolith
46%inclusion1.53K decks3.36K decks
42%synergy
The Earth Crystal
45%inclusion1.49K decks3.32K decks
40%synergy
Ozolith, the Shattered Spire
43%inclusion1.44K decks3.36K decks
38%synergy
The Great Henge
22%inclusion739 decks3.36K decks
13%synergy
Sword of Truth and Justice
20%inclusion673 decks3.36K decks
19%synergy
Agent's Toolkit
17%inclusion543 decks3.13K decks
17%synergy
Swiftfoot Boots
12%inclusion416 decks3.36K decks
-15%synergy
Lightning Greaves
10%inclusion347 decks3.36K decks
-15%synergy
Agatha's Soul Cauldron
8.2%inclusion275 decks3.36K decks
7%synergy
Enchantments
Resourceful Defense
68%inclusion2.27K decks3.36K decks
66%synergy
Bred for the Hunt
59%inclusion1.85K decks3.13K decks
56%synergy
Rhythm of the Wild
59%inclusion54 decks92 decks
36%synergy
Inexorable Tide
55%inclusion1.71K decks3.13K decks
52%synergy
Branching Evolution
50%inclusion1.66K decks3.36K decks
43%synergy
Together Forever
49%inclusion1.63K decks3.36K decks
47%synergy
Innkeeper's Talent
43%inclusion1.45K decks3.36K decks
39%synergy
All Will Be One
42%inclusion39 decks92 decks
40%synergy
Terrasymbiosis
32%inclusion815 decks2.57K decks
26%synergy
Simic Ascendancy
30%inclusion929 decks3.13K decks
24%synergy
Brokers Ascendancy
28%inclusion887 decks3.13K decks
23%synergy
Uncivil Unrest
28%inclusion26 decks92 decks
27%synergy
Annie Joins Up
25%inclusion23 decks92 decks
12%synergy
Freed from the Real
24%inclusion763 decks3.13K decks
22%synergy
Fight Rigging
22%inclusion752 decks3.36K decks
21%synergy
Hollowmurk Siege
21%inclusion10 decks47 decks
18%synergy
Mayael's Aria
20%inclusion18 decks92 decks
17%synergy
Pemmin's Aura
18%inclusion565 decks3.13K decks
17%synergy
Doubling Season
18%inclusion598 decks3.36K decks
8%synergy
Invigorating Hot Spring
16%inclusion15 decks92 decks
14%synergy
Loading Zone
16%inclusion393 decks2.49K decks
14%synergy
Summoner's Sending
14%inclusion485 decks3.36K decks
14%synergy
Barrensteppe Siege
11%inclusion5 decks47 decks
9%synergy
Smothering Tithe
9.4%inclusion314 decks3.36K decks
-13%synergy
Path of Discovery
9.2%inclusion310 decks3.36K decks
8%synergy
Mystic Remora
9.2%inclusion287 decks3.13K decks
-7%synergy
Ripples of Undeath
8.5%inclusion4 decks47 decks
4%synergy
Court of Garenbrig
8.2%inclusion276 decks3.36K decks
6%synergy
Cathars' Crusade
7.1%inclusion240 decks3.36K decks
2%synergy
Tribute to the World Tree
7.1%inclusion239 decks3.36K decks
2%synergy
Abzan Ascendancy
6.4%inclusion3 decks47 decks
5%synergy
Vraska Joins Up
6.4%inclusion3 decks47 decks
3%synergy
Grave Pact
6.4%inclusion3 decks47 decks
2%synergy
The Meathook Massacre
6.4%inclusion3 decks47 decks
1%synergy
Moldervine Reclamation
6.4%inclusion3 decks47 decks
-1%synergy
Black Market Connections
6.4%inclusion3 decks47 decks
-6%synergy
Phyrexian Arena
6.4%inclusion3 decks47 decks
-9%synergy
Communal Brewing
5.6%inclusion187 decks3.36K decks
4%synergy
Garruk's Uprising
5.5%inclusion184 decks3.36K decks
-11%synergy
Planeswalkers
Vraska, Betrayal's Sting
23%inclusion11 decks47 decks
21%synergy
Elspeth Resplendent
17%inclusion569 decks3.36K decks
16%synergy
Utility Lands
Nesting Grounds
73%inclusion2.44K decks3.36K decks
70%synergy
Forge of Heroes
37%inclusion1.24K decks3.36K decks
36%synergy
Karn's Bastion
37%inclusion1.23K decks3.36K decks
32%synergy
Temple of the False God
24%inclusion806 decks3.36K decks
15%synergy
Reliquary Tower
22%inclusion746 decks3.36K decks
-8%synergy
Gavony Township
22%inclusion744 decks3.36K decks
14%synergy
Boseiju, Who Endures
16%inclusion538 decks3.36K decks
-3%synergy
Bojuka Bog
15%inclusion7 decks47 decks
-15%synergy
Yavimaya, Cradle of Growth
14%inclusion467 decks3.36K decks
5%synergy
Kessig Wolf Run
13%inclusion12 decks92 decks
-2%synergy
Zanarkand, Ancient Metropolis
11%inclusion374 decks3.36K decks
10%synergy
Otawara, Soaring City
11%inclusion335 decks3.13K decks
-6%synergy
Rogue's Passage
10%inclusion349 decks3.36K decks
-10%synergy
Diamond City
9.2%inclusion308 decks3.36K decks
9%synergy
Mistrise Village
9.0%inclusion281 decks3.13K decks
1%synergy
Phyrexian Tower
8.5%inclusion4 decks47 decks
0%synergy
Vault of the Archangel
6.4%inclusion3 decks47 decks
-6%synergy
Arena of Glory
5.4%inclusion5 decks92 decks
-1%synergy
Mana Artifacts
Sol Ring
96%inclusion3.21K decks3.36K decks
12%synergy
Arcane Signet
91%inclusion3.06K decks3.36K decks
19%synergy
Everflowing Chalice
51%inclusion1.72K decks3.36K decks
47%synergy
Talisman of Resilience
13%inclusion6 decks47 decks
0%synergy
Talisman of Hierarchy
8.5%inclusion4 decks47 decks
-18%synergy
Talisman of Impulse
7.6%inclusion7 decks92 decks
-3%synergy
Astral Cornucopia
6.9%inclusion231 decks3.36K decks
6%synergy
Fellwar Stone
5.5%inclusion185 decks3.36K decks
-15%synergy
Strixhaven Stadium
5.1%inclusion172 decks3.36K decks
5%synergy
Lands
Command Tower
98%inclusion3.30K decks3.36K decks
24%synergy
Hinterland Harbor
83%inclusion2.60K decks3.13K decks
51%synergy
Sunpetal Grove
81%inclusion2.73K decks3.36K decks
54%synergy
Glacial Fortress
81%inclusion2.53K decks3.13K decks
49%synergy
Exotic Orchard
79%inclusion2.67K decks3.36K decks
43%synergy
Seaside Citadel
73%inclusion2.27K decks3.13K decks
46%synergy
Canopy Vista
71%inclusion2.40K decks3.36K decks
35%synergy
Prairie Stream
69%inclusion2.17K decks3.13K decks
36%synergy
Brushland
68%inclusion2.28K decks3.36K decks
49%synergy
Flooded Grove
65%inclusion2.05K decks3.13K decks
50%synergy
Path of Ancestry
56%inclusion1.87K decks3.36K decks
34%synergy
Stomping Ground
53%inclusion49 decks92 decks
12%synergy
Fortified Village
51%inclusion1.72K decks3.36K decks
35%synergy
Vineglimmer Snarl
51%inclusion1.61K decks3.13K decks
40%synergy
Sacred Foundry
51%inclusion47 decks92 decks
15%synergy
Port Town
51%inclusion1.60K decks3.13K decks
36%synergy
The World Tree
50%inclusion3 decks6 decks
21%synergy
Breeding Pool
49%inclusion1.54K decks3.13K decks
8%synergy
Overgrown Tomb
47%inclusion22 decks47 decks
7%synergy
Cinder Glade
47%inclusion43 decks92 decks
8%synergy
Overflowing Basin
46%inclusion1.45K decks3.13K decks
38%synergy
Sungrass Prairie
46%inclusion1.55K decks3.36K decks
33%synergy
Skycloud Expanse
46%inclusion1.44K decks3.13K decks
32%synergy
Temple Garden
44%inclusion1.49K decks3.36K decks
6%synergy
Watery Grave
43%inclusion13 decks30 decks
2%synergy
Steam Vents
43%inclusion3 decks7 decks
5%synergy
Godless Shrine
43%inclusion20 decks47 decks
2%synergy
Jungle Shrine
42%inclusion39 decks92 decks
11%synergy
Hallowed Fountain
42%inclusion1.33K decks3.13K decks
3%synergy
Spara's Headquarters
42%inclusion1.32K decks3.13K decks
14%synergy
Temple of Mystery
42%inclusion1.31K decks3.13K decks
25%synergy
Temple of Plenty
42%inclusion1.40K decks3.36K decks
28%synergy
Temple of Enlightenment
41%inclusion1.28K decks3.13K decks
24%synergy
Indatha Triome
40%inclusion19 decks47 decks
12%synergy
Sandsteppe Citadel
38%inclusion18 decks47 decks
13%synergy
Rejuvenating Springs
37%inclusion1.16K decks3.13K decks
10%synergy
Raffine's Tower
37%inclusion11 decks30 decks
12%synergy
Evolving Wilds
35%inclusion1.19K decks3.36K decks
14%synergy
Windswept Heath
35%inclusion1.18K decks3.36K decks
24%synergy
Tangled Islet
35%inclusion1.10K decks3.13K decks
29%synergy
Rootbound Crag
35%inclusion32 decks92 decks
7%synergy
Jetmir's Garden
35%inclusion32 decks92 decks
5%synergy
Clifftop Retreat
35%inclusion32 decks92 decks
0%synergy
Radiant Grove
35%inclusion1.17K decks3.36K decks
29%synergy
Idyllic Beachfront
34%inclusion1.07K decks3.13K decks
31%synergy
Llanowar Wastes
34%inclusion16 decks47 decks
7%synergy
Bountiful Promenade
33%inclusion1.12K decks3.36K decks
11%synergy
Flooded Strand
32%inclusion1.07K decks3.36K decks
21%synergy
Rockfall Vale
30%inclusion28 decks92 decks
9%synergy
Sea of Clouds
30%inclusion942 decks3.13K decks
5%synergy