Kefka, Court Mage (Commander) - Budget cEDH Midrange

Cooper Gottfried
Apr 6, 2026
The Top 20 Commanders With Two-Card Combos
Kicking off Combo Week at EDHREC is a list of the top 20 commanders that have two-card combos. Do you play any of these?
Deck Filters
Cardsphere
Archidekt
Commander Spellbook
Moxfield
Scryfall
MTGStocks
Flashback
33%inclusion1 decks3 decks
27%synergy
High Synergy Cards
Cabal Ritual
81%inclusion13 decks16 decks
71%synergy
Displacer Kitten
75%inclusion12 decks16 decks
70%synergy
Brain Freeze
75%inclusion12 decks16 decks
67%synergy
Mystic Remora
81%inclusion13 decks16 decks
66%synergy
Mental Misstep
69%inclusion11 decks16 decks
62%synergy
Demonic Consultation
69%inclusion11 decks16 decks
61%synergy
Flusterstorm
69%inclusion11 decks16 decks
60%synergy
Pact of Negation
69%inclusion11 decks16 decks
60%synergy
Harmonic Prodigy
69%inclusion11 decks16 decks
59%synergy
Saw in Half
63%inclusion10 decks16 decks
57%synergy
Top Cards
Dark Ritual
81%inclusion13 decks16 decks
44%synergy
An Offer You Can't Refuse
69%inclusion11 decks16 decks
39%synergy
Ragavan, Nimble Pilferer
69%inclusion11 decks16 decks
57%synergy
Reanimate
69%inclusion11 decks16 decks
44%synergy
Deflecting Swat
69%inclusion11 decks16 decks
50%synergy
Deadly Rollick
63%inclusion10 decks16 decks
45%synergy
Tainted Pact
63%inclusion10 decks16 decks
56%synergy
Simian Spirit Guide
63%inclusion10 decks16 decks
55%synergy
Valley Floodcaller
63%inclusion10 decks16 decks
55%synergy
Rite of Flame
63%inclusion10 decks16 decks
56%synergy
Game Changers
Underworld Breach
88%inclusion14 decks16 decks
76%synergy
Fierce Guardianship
81%inclusion13 decks16 decks
62%synergy
Demonic Tutor
75%inclusion12 decks16 decks
54%synergy
Thassa's Oracle
69%inclusion11 decks16 decks
60%synergy
Rhystic Study
69%inclusion11 decks16 decks
46%synergy
Mana Vault
69%inclusion11 decks16 decks
60%synergy
Force of Will
69%inclusion11 decks16 decks
58%synergy
Gamble
69%inclusion11 decks16 decks
59%synergy
Chrome Mox
69%inclusion11 decks16 decks
60%synergy
Orcish Bowmasters
63%inclusion10 decks16 decks
44%synergy
Creatures
Dauthi Voidwalker
63%inclusion10 decks16 decks
55%synergy
Phyrexian Metamorph
56%inclusion9 decks16 decks
51%synergy
Dualcaster Mage
50%inclusion8 decks16 decks
42%synergy
Mockingbird
44%inclusion7 decks16 decks
42%synergy
Psychosis Crawler
38%inclusion6 decks16 decks
30%synergy
Phantasmal Image
38%inclusion6 decks16 decks
35%synergy
Hullbreaker Horror
38%inclusion6 decks16 decks
33%synergy
Hexing Squelcher
33%inclusion3 decks9 decks
22%synergy
Opposition Agent
31%inclusion5 decks16 decks
26%synergy
Roaming Throne
31%inclusion5 decks16 decks
23%synergy
Faerie Mastermind
31%inclusion5 decks16 decks
24%synergy
Birgi, God of Storytelling
31%inclusion5 decks16 decks
25%synergy
Tinybones, Bauble Burglar
31%inclusion5 decks16 decks
27%synergy
Vivi Ornitier
31%inclusion5 decks16 decks
23%synergy
Gogo, Mysterious Mime
31%inclusion5 decks16 decks
29%synergy
Professional Face-Breaker
25%inclusion4 decks16 decks
21%synergy
Hoarding Broodlord
25%inclusion4 decks16 decks
24%synergy
Volatile Stormdrake
19%inclusion3 decks16 decks
18%synergy
Dragon's Rage Channeler
19%inclusion3 decks16 decks
17%synergy
Flesh Duplicate
19%inclusion3 decks16 decks
18%synergy
Sheoldred, the Apocalypse
19%inclusion3 decks16 decks
10%synergy
Deadpool, Trading Card
19%inclusion3 decks16 decks
17%synergy
Tergrid, God of Fright
19%inclusion3 decks16 decks
13%synergy
Worldgorger Dragon
19%inclusion3 decks16 decks
18%synergy
Pinnacle Monk
19%inclusion3 decks16 decks
15%synergy
Gogo, Master of Mimicry
19%inclusion3 decks16 decks
16%synergy
Wan Shi Tong, Librarian
18%inclusion2 decks11 decks
13%synergy
Irma, Part-Time Mutant
17%inclusion1 decks6 decks
14%synergy
Tinybones, Trinket Thief
13%inclusion2 decks16 decks
12%synergy
Thassa, Deep-Dwelling
13%inclusion2 decks16 decks
9%synergy
Kroxa, Titan of Death's Hunger
13%inclusion2 decks16 decks
10%synergy
Niv-Mizzet, Parun
13%inclusion2 decks16 decks
7%synergy
Imperial Recruiter
13%inclusion2 decks16 decks
10%synergy
Malevolent Hermit
13%inclusion2 decks16 decks
11%synergy
Nightscape Familiar
13%inclusion2 decks16 decks
-15%synergy
Razorkin Needlehead
13%inclusion2 decks16 decks
7%synergy
Clever Impersonator
13%inclusion2 decks16 decks
10%synergy
Magus of the Wheel
13%inclusion2 decks16 decks
6%synergy
Chameleon, Master of Disguise
9.1%inclusion1 decks11 decks
3%synergy
Starfield Vocalist
8.3%inclusion1 decks12 decks
7%synergy
Squee, Goblin Nabob
6.3%inclusion1 decks16 decks
6%synergy
Syr Konrad, the Grim
6.3%inclusion1 decks16 decks
3%synergy
Scholar of the Ages
6.3%inclusion1 decks16 decks
5%synergy
Grim Servant
6.3%inclusion1 decks16 decks
6%synergy
Scrawling Crawler
6.3%inclusion1 decks16 decks
-3%synergy
High Fae Trickster
6.3%inclusion1 decks16 decks
0%synergy
Snapcaster Mage
6.3%inclusion1 decks16 decks
1%synergy
Yusri, Fortune's Flame
6.3%inclusion1 decks16 decks
6%synergy
Consecrated Sphinx
6.3%inclusion1 decks16 decks
4%synergy
Morbid Opportunist
6.3%inclusion1 decks16 decks
5%synergy
Instants
Swan Song
63%inclusion10 decks16 decks
43%synergy
Vampiric Tutor
63%inclusion10 decks16 decks
47%synergy
Essence Flux
56%inclusion9 decks16 decks
50%synergy
Borne Upon a Wind
56%inclusion9 decks16 decks
47%synergy
Cyclonic Rift
56%inclusion9 decks16 decks
35%synergy
Mystical Tutor
56%inclusion9 decks16 decks
43%synergy
Chain of Vapor
50%inclusion8 decks16 decks
45%synergy
Mindbreak Trap
50%inclusion8 decks16 decks
44%synergy
Entomb
44%inclusion7 decks16 decks
38%synergy
Force of Negation
38%inclusion6 decks16 decks
29%synergy
Gifts Ungiven
31%inclusion5 decks16 decks
29%synergy
Culling the Weak
31%inclusion5 decks16 decks
26%synergy
Mana Drain
31%inclusion5 decks16 decks
15%synergy
Into the Flood Maw
31%inclusion5 decks16 decks
27%synergy
Ad Nauseam
31%inclusion5 decks16 decks
26%synergy
Arcane Denial
31%inclusion5 decks16 decks
3%synergy
Red Elemental Blast
31%inclusion5 decks16 decks
25%synergy
Pyroblast
31%inclusion5 decks16 decks
26%synergy
Burnt Offering
25%inclusion4 decks16 decks
23%synergy
Ghostly Flicker
25%inclusion4 decks16 decks
18%synergy
Counterspell
25%inclusion4 decks16 decks
-19%synergy
Untimely Malfunction
19%inclusion3 decks16 decks
13%synergy
Negate
19%inclusion3 decks16 decks
-4%synergy
Desperate Ritual
19%inclusion3 decks16 decks
16%synergy
Lim-Dûl's Vault
19%inclusion3 decks16 decks
16%synergy
Lightning Bolt
19%inclusion3 decks16 decks
8%synergy
Pyretic Ritual
19%inclusion3 decks16 decks
15%synergy
Final Fortune
19%inclusion3 decks16 decks
13%synergy
Sacrifice
13%inclusion2 decks16 decks
12%synergy
Chaos Warp
13%inclusion2 decks16 decks
-22%synergy
Frantic Search
13%inclusion2 decks16 decks
-8%synergy
Retraction Helix
13%inclusion2 decks16 decks
12%synergy
Dispel
13%inclusion2 decks16 decks
9%synergy
Planar Incision
13%inclusion2 decks16 decks
10%synergy
Spell Pierce
13%inclusion2 decks16 decks
9%synergy
Snapback
13%inclusion2 decks16 decks
12%synergy
Dismember
13%inclusion2 decks16 decks
11%synergy
Redirect Lightning
9.1%inclusion1 decks11 decks
0%synergy
Blur
6.3%inclusion1 decks16 decks
5%synergy
Muddle the Mixture
6.3%inclusion1 decks16 decks
4%synergy
Consign to Memory
6.3%inclusion1 decks16 decks
6%synergy
Shred Memory
6.3%inclusion1 decks16 decks
6%synergy
Cut Down
6.3%inclusion1 decks16 decks
6%synergy
Three Steps Ahead
6.3%inclusion1 decks16 decks
4%synergy
Run Away Together
6.3%inclusion1 decks16 decks
5%synergy
Brainstorm
6.3%inclusion1 decks16 decks
-11%synergy
Stubborn Denial
6.3%inclusion1 decks16 decks
5%synergy
Stern Scolding
6.3%inclusion1 decks16 decks
6%synergy
Fact or Fiction
6.3%inclusion1 decks16 decks
-1%synergy
Flare of Denial
6.3%inclusion1 decks16 decks
5%synergy
Sorceries
Windfall
56%inclusion9 decks16 decks
33%synergy
Toxic Deluge
56%inclusion9 decks16 decks
36%synergy
Jeska's Will
44%inclusion7 decks16 decks
27%synergy
Imperial Seal
44%inclusion7 decks16 decks
37%synergy
Mnemonic Betrayal
44%inclusion7 decks16 decks
39%synergy
Wheel of Fortune
38%inclusion6 decks16 decks
28%synergy
Diabolic Intent
31%inclusion5 decks16 decks
24%synergy
Praetor's Grasp
25%inclusion4 decks16 decks
20%synergy
Blasphemous Act
25%inclusion4 decks16 decks
-19%synergy
Twinflame
25%inclusion4 decks16 decks
22%synergy
Molten Duplication
25%inclusion4 decks16 decks
23%synergy
Peer into the Abyss
19%inclusion3 decks16 decks
13%synergy
Vandalblast
19%inclusion3 decks16 decks
3%synergy
Demonic Counsel
19%inclusion3 decks16 decks
14%synergy
Wheel of Misfortune
13%inclusion2 decks16 decks
8%synergy
Electroduplicate
13%inclusion2 decks16 decks
11%synergy
Gitaxian Probe
13%inclusion2 decks16 decks
7%synergy
Faithless Looting
13%inclusion2 decks16 decks
-7%synergy
Dark Deal
13%inclusion2 decks16 decks
5%synergy
Winds of Change
13%inclusion2 decks16 decks
8%synergy
Megaton's Fate
6.3%inclusion1 decks16 decks
6%synergy
Extinction Event
6.3%inclusion1 decks16 decks
6%synergy
Unmarked Grave
6.3%inclusion1 decks16 decks
5%synergy
Wheel of Fate
6.3%inclusion1 decks16 decks
3%synergy
Stock Up
6.3%inclusion1 decks16 decks
4%synergy
Echo of Eons
6.3%inclusion1 decks16 decks
3%synergy
Profane Tutor
6.3%inclusion1 decks16 decks
2%synergy
Will of the Jeskai
6.3%inclusion1 decks16 decks
4%synergy
Yawgmoth's Will
6.3%inclusion1 decks16 decks
3%synergy
Persist
6.3%inclusion1 decks16 decks
3%synergy
Feed the Swarm
6.3%inclusion1 decks16 decks
-22%synergy
Yahenni's Expertise
6.3%inclusion1 decks16 decks
6%synergy
Blasphemous Edict
6.3%inclusion1 decks16 decks
0%synergy
Scheming Symmetry
6.3%inclusion1 decks16 decks
5%synergy
Buried Alive
6.3%inclusion1 decks16 decks
3%synergy
Final Parting
6.3%inclusion1 decks16 decks
5%synergy
Syphon Mind
6.3%inclusion1 decks16 decks
3%synergy
Insatiable Avarice
6.3%inclusion1 decks16 decks
4%synergy
Burning Inquiry
6.3%inclusion1 decks16 decks
4%synergy
Expressive Iteration
6.3%inclusion1 decks16 decks
3%synergy
Beseech the Mirror
6.3%inclusion1 decks16 decks
1%synergy
Crippling Fear
6.3%inclusion1 decks16 decks
5%synergy
Chain of Smog
6.3%inclusion1 decks16 decks
6%synergy
Reforge the Soul
6.3%inclusion1 decks16 decks
2%synergy
Thoughtseize
6.3%inclusion1 decks16 decks
6%synergy
Nuclear Fallout
6.3%inclusion1 decks16 decks
6%synergy
Nibelheim Aflame
6.3%inclusion1 decks16 decks
5%synergy
Utility Artifacts
The One Ring
56%inclusion9 decks16 decks
44%synergy
Wishclaw Talisman
44%inclusion7 decks16 decks
36%synergy
Grinding Station
25%inclusion4 decks16 decks
23%synergy
Bolas's Citadel
25%inclusion4 decks16 decks
20%synergy
Lightning Greaves
25%inclusion4 decks16 decks
-4%synergy
Monument to Endurance
25%inclusion4 decks16 decks
18%synergy
Sensei's Divining Top
13%inclusion2 decks16 decks
9%synergy
Cursed Totem
13%inclusion2 decks16 decks
12%synergy
Mindcrank
13%inclusion2 decks16 decks
10%synergy
Entropic Battlecruiser
8.3%inclusion1 decks12 decks
5%synergy
Unwinding Clock
6.3%inclusion1 decks16 decks
4%synergy
Elixir of Immortality
6.3%inclusion1 decks16 decks
5%synergy
Defense Grid
6.3%inclusion1 decks16 decks
3%synergy
Manifold Key
6.3%inclusion1 decks16 decks
6%synergy
The Underworld Cookbook
6.3%inclusion1 decks16 decks
6%synergy
Vexing Bauble
6.3%inclusion1 decks16 decks
5%synergy
Aetherflux Reservoir
6.3%inclusion1 decks16 decks
5%synergy
Panharmonicon
6.3%inclusion1 decks16 decks
1%synergy
Shadowspear
6.3%inclusion1 decks16 decks
3%synergy
Conqueror's Flail
6.3%inclusion1 decks16 decks
5%synergy
Sword of Wealth and Power
6.3%inclusion1 decks16 decks
5%synergy
Geth's Grimoire
6.3%inclusion1 decks16 decks
2%synergy
Saheeli's Lattice
6.3%inclusion1 decks16 decks
6%synergy
Enchantments
Waste Not
56%inclusion9 decks16 decks
44%synergy
Necropotence
56%inclusion9 decks16 decks
50%synergy
Animate Dead
50%inclusion8 decks16 decks
41%synergy
Necromancy
31%inclusion5 decks16 decks
28%synergy
Bloodchief Ascension
25%inclusion4 decks16 decks
21%synergy
Dance of the Dead
13%inclusion2 decks16 decks
11%synergy
Psychic Corrosion
13%inclusion2 decks16 decks
12%synergy
Mirrormade
13%inclusion2 decks16 decks
10%synergy
Counterbalance
6.3%inclusion1 decks16 decks
6%synergy
Teferi's Ageless Insight
6.3%inclusion1 decks16 decks
4%synergy
Unstoppable Plan
6.3%inclusion1 decks16 decks
5%synergy
Archmage Ascension
6.3%inclusion1 decks16 decks
6%synergy
Copy Enchantment
6.3%inclusion1 decks16 decks
5%synergy
Powerbalance
6.3%inclusion1 decks16 decks
5%synergy
Training Grounds
6.3%inclusion1 decks16 decks
6%synergy
Phyresis
6.3%inclusion1 decks16 decks
4%synergy
Amphibian Downpour
6.3%inclusion1 decks16 decks
5%synergy
Liliana's Caress
6.3%inclusion1 decks16 decks
-1%synergy
Frostcliff Siege
6.3%inclusion1 decks16 decks
3%synergy
Ophidian Eye
6.3%inclusion1 decks16 decks
5%synergy
Phyrexian Arena
6.3%inclusion1 decks16 decks
-3%synergy
Oppression
6.3%inclusion1 decks16 decks
5%synergy
Planeswalkers
Professor Onyx
6.3%inclusion1 decks16 decks
4%synergy
Karn, the Great Creator
6.3%inclusion1 decks16 decks
6%synergy
Narset, Parter of Veils
6.3%inclusion1 decks16 decks
3%synergy
Ral, Storm Conduit
6.3%inclusion1 decks16 decks
5%synergy
Utility Lands
Ancient Tomb
56%inclusion9 decks16 decks
43%synergy
Arena of Glory
50%inclusion8 decks16 decks
45%synergy
Mistrise Village
44%inclusion7 decks16 decks
36%synergy
Otawara, Soaring City
44%inclusion7 decks16 decks
28%synergy
Urza's Saga
25%inclusion4 decks16 decks
20%synergy
Emergence Zone
25%inclusion4 decks16 decks
22%synergy
Seat of the Synod
19%inclusion3 decks16 decks
13%synergy
Bojuka Bog
13%inclusion2 decks16 decks
-12%synergy
Phyrexian Tower
13%inclusion2 decks16 decks
7%synergy
Command Beacon
13%inclusion2 decks16 decks
8%synergy
Reliquary Tower
13%inclusion2 decks16 decks
-23%synergy
Cephalid Coliseum
13%inclusion2 decks16 decks
10%synergy
Great Furnace
13%inclusion2 decks16 decks
7%synergy
Minamo, School at Water's Edge
6.3%inclusion1 decks16 decks
4%synergy
Mystic Sanctuary
6.3%inclusion1 decks16 decks
2%synergy
Hall of the Bandit Lord
6.3%inclusion1 decks16 decks
6%synergy
The Black Gate
6.3%inclusion1 decks16 decks
-2%synergy
Scavenger Grounds
6.3%inclusion1 decks16 decks
5%synergy
Cabal Coffers
6.3%inclusion1 decks16 decks
2%synergy
Geier Reach Sanitarium
6.3%inclusion1 decks16 decks
-1%synergy
Cabal Pit
6.3%inclusion1 decks16 decks
6%synergy
Deserted Temple
6.3%inclusion1 decks16 decks
6%synergy
Academy Ruins
6.3%inclusion1 decks16 decks
2%synergy
Mikokoro, Center of the Sea
6.3%inclusion1 decks16 decks
4%synergy
Takenuma, Abandoned Mire
6.3%inclusion1 decks16 decks
1%synergy
Urborg, Tomb of Yawgmoth
6.3%inclusion1 decks16 decks
-8%synergy
Eden, Seat of the Sanctum
6.3%inclusion1 decks16 decks
6%synergy
Mana Artifacts
Sol Ring
100%inclusion16 decks16 decks
10%synergy
Arcane Signet
94%inclusion15 decks16 decks
6%synergy
Talisman of Dominance
81%inclusion13 decks16 decks
32%synergy
Lotus Petal
75%inclusion12 decks16 decks
64%synergy
Talisman of Creativity
69%inclusion11 decks16 decks
24%synergy
Talisman of Indulgence
63%inclusion10 decks16 decks
19%synergy
Mox Opal
63%inclusion10 decks16 decks
55%synergy
Fellwar Stone
56%inclusion9 decks16 decks
21%synergy
Mox Amber
38%inclusion6 decks16 decks
32%synergy
Lion's Eye Diamond
31%inclusion5 decks16 decks
25%synergy
Mox Diamond
25%inclusion4 decks16 decks
18%synergy
Grim Monolith
19%inclusion3 decks16 decks
14%synergy
Thought Vessel
19%inclusion3 decks16 decks
-3%synergy
Izzet Signet
6.3%inclusion1 decks16 decks
-26%synergy
Rakdos Signet
6.3%inclusion1 decks16 decks
-27%synergy
Dimir Signet
6.3%inclusion1 decks16 decks
-29%synergy
Relic of Sauron
6.3%inclusion1 decks16 decks
-13%synergy
Liquimetal Torque
6.3%inclusion1 decks16 decks
4%synergy
Mind Stone
6.3%inclusion1 decks16 decks
-7%synergy
Jeweled Amulet
6.3%inclusion1 decks16 decks
6%synergy
Lands
Command Tower
100%inclusion16 decks16 decks
8%synergy
Bloodstained Mire
94%inclusion15 decks16 decks
59%synergy
Watery Grave
94%inclusion15 decks16 decks
46%synergy
Steam Vents
88%inclusion14 decks16 decks
42%synergy
Blood Crypt
88%inclusion14 decks16 decks
42%synergy
Scalding Tarn
88%inclusion14 decks16 decks
55%synergy
Island
75%inclusion12 decks16 decks
-18%synergy
Polluted Delta
75%inclusion12 decks16 decks
40%synergy
Swamp
69%inclusion11 decks16 decks
-23%synergy
Gemstone Caverns
69%inclusion11 decks16 decks
61%synergy
Exotic Orchard
56%inclusion9 decks16 decks
0%synergy
Morphic Pool
50%inclusion8 decks16 decks
18%synergy
Mana Confluence
50%inclusion8 decks16 decks
38%synergy
Marsh Flats
50%inclusion8 decks16 decks
40%synergy
Training Center
50%inclusion8 decks16 decks
18%synergy
Flooded Strand
50%inclusion8 decks16 decks
39%synergy
Undercity Sewers
44%inclusion7 decks16 decks
31%synergy
Verdant Catacombs
44%inclusion7 decks16 decks
34%synergy
Cavern of Souls
44%inclusion7 decks16 decks
37%synergy
Mountain
44%inclusion7 decks16 decks
-48%synergy
Raucous Theater
38%inclusion6 decks16 decks
27%synergy
Misty Rainforest
38%inclusion6 decks16 decks
27%synergy
Luxury Suite
38%inclusion6 decks16 decks
6%synergy
City of Brass
38%inclusion6 decks16 decks
24%synergy
Shivan Reef
31%inclusion5 decks16 decks
2%synergy
Riverpyre Verge
31%inclusion5 decks16 decks
24%synergy
Wooded Foothills
31%inclusion5 decks16 decks
23%synergy
Xander's Lounge
31%inclusion5 decks16 decks
-9%synergy
Blazemire Verge
31%inclusion5 decks16 decks
22%synergy
Arid Mesa
31%inclusion5 decks16 decks
22%synergy
Thundering Falls
31%inclusion5 decks16 decks
21%synergy
Gloomlake Verge
31%inclusion5 decks16 decks
22%synergy
Starting Town
31%inclusion5 decks16 decks
26%synergy
Underground River
25%inclusion4 decks16 decks
-3%synergy
Talon Gates of Madara
25%inclusion4 decks16 decks
24%synergy
Sulfurous Springs
25%inclusion4 decks16 decks
-3%synergy
Spire of Industry
19%inclusion3 decks16 decks
14%synergy
Shipwreck Marsh
19%inclusion3 decks16 decks
-6%synergy
Dragonskull Summit
19%inclusion3 decks16 decks
-26%synergy
Reflecting Pool
19%inclusion3 decks16 decks
10%synergy
Sulfur Falls
19%inclusion3 decks16 decks
-28%synergy
Darkslick Shores
19%inclusion3 decks16 decks
15%synergy
Forbidden Orchard
19%inclusion3 decks16 decks
16%synergy
Haunted Ridge
19%inclusion3 decks16 decks
-2%synergy
Pinnacle Monk
19%inclusion3 decks16 decks
15%synergy
Badlands
13%inclusion2 decks16 decks
-3%synergy
Smoldering Marsh
13%inclusion2 decks16 decks
-25%synergy
Stormcarved Coast
13%inclusion2 decks16 decks
-13%synergy
Darkwater Catacombs
13%inclusion2 decks16 decks
1%synergy
Underground Sea
13%inclusion2 decks16 decks
-3%synergy