Ancient Grudge (Card)
Ancient Grudge
In 11936 decks
1% of 1080840 decks
Aug 15, 2023
Uncommanders: Sliver's Strength
Alejandro Fuentes rethinks how to build Slivers with this unique pauper EDH deck.
Kibo, Uktabi Prince
28.63% of 9714 decks
2781 decks
Flubs, the Fool
24.61% of 8326 decks
2049 decks
Tovolar, Dire Overlord
13.64% of 11035 decks
1505 decks
Rin and Seri, Inseparable
2.41% of 15826 decks
382 decks
Gallia of the Endless Dance
31.21% of 1192 decks
372 decks
Kalamax, the Stormsire
1.59% of 7024 decks
112 decks
Minsc & Boo, Timeless Heroes
1.70% of 6401 decks
109 decks
The Beamtown Bullies
1.92% of 4957 decks
95 decks
Svella, Ice Shaper
3.51% of 2596 decks
91 decks
Omnath, Locus of Rage
1.14% of 7102 decks
81 decks
Miirym, Sentinel Wyrm
0.34% of 21039 decks
72 decks
Faldorn, Dread Wolf Herald
1.12% of 6439 decks
72 decks
Etali, Primal Conqueror
0.80% of 8603 decks
69 decks
Haldan, Avid Arcanist // Pako, Arcane Retriever
0.91% of 7356 decks
67 decks
Atla Palani, Nest Tender
0.44% of 15270 decks
67 decks
Gishath, Sun's Avatar
0.34% of 19148 decks
66 decks
Cait, Cage Brawler
14.25% of 463 decks
66 decks
Raggadragga, Goreguts Boss
0.94% of 6904 decks
65 decks
New Cards
Loot, Exuberant Explorer
68% of 217 decks
+42% synergy
Blasphemous Edict
50% of 18 decks
+16% synergy
Armasaur Guide
50% of 6 decks
+39% synergy
Walk-In Closet // Forgotten Cellar
40% of 574 decks
+25% synergy
Arahbo, the First Fang
34% of 68 decks
+30% synergy
High Synergy Cards
Fortune Teller's Talent
58% of 875 decks
+56% synergy
Song of Creation
57% of 3361 decks
+54% synergy
Eruth, Tormented Prophet
43% of 3284 decks
+42% synergy
Fblthp, Lost on the Range
34% of 2414 decks
+33% synergy
Doc Aurlock, Grizzled Genius
33% of 2400 decks
+28% synergy
Ambush Wolf
33% of 15 decks
+25% synergy
Kellan, Planar Trailblazer
30% of 23 decks
+24% synergy
Pack Leader
24% of 1546 decks
+23% synergy
Barrowgoyf
24% of 289 decks
+23% synergy
Wonder
25% of 3394 decks
+22% synergy
Top Cards
Cultivate
51% of 11922 decks
+5% synergy
Swords to Plowshares
48% of 1582 decks
-15% synergy
Beast Within
43% of 11921 decks
+5% synergy
Rampant Growth
41% of 11934 decks
+6% synergy
Growth Spiral
41% of 3375 decks
+19% synergy
Path to Exile
35% of 1581 decks
-11% synergy
Ignoble Hierarch
34% of 1233 decks
+8% synergy
Nature's Lore
34% of 11934 decks
+1% synergy
Blasphemous Act
33% of 11919 decks
-0% synergy
Kodama's Reach
33% of 11934 decks
+2% synergy
Creatures
Mossborn Hydra
29% of 405 decks
+18% synergy
Tatyova, Benthic Druid
29% of 3376 decks
+17% synergy
Goblin Anarchomancer
28% of 11727 decks
+15% synergy
Six
27% of 4444 decks
+19% synergy
Generous Pup
24% of 51 decks
+21% synergy
Kogla, the Titan Ape
23% of 11820 decks
+20% synergy
Overlord of the Balemurk
23% of 73 decks
+16% synergy
Jetmir, Nexus of Revels
23% of 1465 decks
+16% synergy
Skyknight Squire
23% of 26 decks
+14% synergy
Kogla and Yidaro
23% of 9021 decks
+18% synergy
Kutzil, Malamet Exemplar
22% of 709 decks
+3% synergy
Silverback Elder
22% of 10773 decks
+20% synergy
Hugs, Grisly Guardian
22% of 2732 decks
+18% synergy
Yavimaya Steelcrusher
22% of 10774 decks
+21% synergy
Jinnie Fay, Jetmir's Second
22% of 1465 decks
+18% synergy
Gorilla Shaman
21% of 11935 decks
+21% synergy
Regal Caracal
21% of 1572 decks
+20% synergy
Uktabi Orangutan
21% of 11934 decks
+21% synergy
Phelia, Exuberant Shepherd
20% of 401 decks
+18% synergy
Birds of Paradise
20% of 11934 decks
-7% synergy
Uro, Titan of Nature's Wrath
20% of 3364 decks
+16% synergy
Towering Gibbon
20% of 9923 decks
+20% synergy
Simian Simulacrum
20% of 10330 decks
+19% synergy
Gearbane Orangutan
20% of 5835 decks
+19% synergy
Selfless Savior
20% of 1546 decks
+18% synergy
Taurean Mauler
19% of 11930 decks
+16% synergy
Loot, the Key to Everything
19% of 2354 decks
+18% synergy
Kird Ape
19% of 11935 decks
+19% synergy
Scrounging Bandar
19% of 11893 decks
+19% synergy
Lier, Disciple of the Drowned
19% of 3305 decks
+17% synergy
Grunn, the Lonely King
19% of 11878 decks
+18% synergy
Spirited Companion
18% of 1481 decks
+14% synergy
Eternal Witness
18% of 11934 decks
-3% synergy
Ferocious Tigorilla
17% of 11821 decks
+17% synergy
Inti, Seneschal of the Sun
17% of 6570 decks
+16% synergy
Faithful Watchdog
17% of 270 decks
+14% synergy
Ocelot Pride
16% of 353 decks
+11% synergy
Silverback Shaman
16% of 11858 decks
+16% synergy
Simian Spirit Guide
16% of 11933 decks
+11% synergy
Ramunap Excavator
16% of 11888 decks
+9% synergy
Deathrite Shaman
16% of 1290 decks
+4% synergy
Realmwalker
16% of 11756 decks
+10% synergy
King of the Pride
16% of 1562 decks
+15% synergy
Azusa, Lost but Seeking
16% of 11934 decks
+8% synergy
Containment Construct
16% of 11299 decks
+15% synergy
Mirri, Weatherlight Duelist
15% of 1570 decks
+12% synergy
Tree Monkey
15% of 11934 decks
+15% synergy
Springheart Nantuko
15% of 4044 decks
+8% synergy
Summit Apes
15% of 11922 decks
+15% synergy
Leonin Warleader
15% of 1570 decks
+13% synergy
Instants
Chaos Warp
31% of 11920 decks
-1% synergy
Assassin's Trophy
26% of 1280 decks
-4% synergy
Heroic Intervention
25% of 11893 decks
-5% synergy
Pongify
23% of 3393 decks
+12% synergy
Terminate
23% of 1303 decks
+2% synergy
Frantic Search
22% of 3394 decks
+10% synergy
Abrade
21% of 11889 decks
+10% synergy
Counterspell
21% of 3394 decks
-22% synergy
Return of the Wildspeaker
20% of 11846 decks
+7% synergy
Return to Nature
20% of 11867 decks
+14% synergy
Inspiring Call
19% of 11906 decks
+11% synergy
Nature's Claim
18% of 11922 decks
+9% synergy
Boros Charm
18% of 1577 decks
-7% synergy
Drag to the Roots
18% of 118 decks
+12% synergy
Untimely Malfunction
17% of 1015 decks
+1% synergy
Cyclonic Rift
16% of 3388 decks
-12% synergy
Generous Gift
15% of 1562 decks
-10% synergy
Rapid Hybridization
15% of 3385 decks
+6% synergy
Obsessive Search
15% of 3394 decks
+15% synergy
Entomb
15% of 1303 decks
+8% synergy
Abrupt Decay
15% of 1290 decks
+5% synergy
Naya Charm
15% of 1580 decks
+8% synergy
Snap
15% of 3394 decks
+8% synergy
Circular Logic
15% of 3394 decks
+14% synergy
Grisly Salvage
14% of 1290 decks
+9% synergy
Fell the Profane
14% of 359 decks
+2% synergy
Planar Genesis
13% of 2155 decks
+6% synergy
Claws Out
13% of 45 decks
+12% synergy
Krosan Grip
13% of 11934 decks
+6% synergy
Dazzling Denial
13% of 522 decks
+10% synergy
Brainstorm
13% of 3394 decks
-8% synergy
Just the Wind
12% of 3380 decks
+12% synergy
Go Forth
12% of 33 decks
+4% synergy
Putrefy
12% of 1302 decks
-4% synergy
Revitalizing Repast
12% of 359 decks
-0% synergy
Vampiric Tutor
12% of 1303 decks
-6% synergy
Siege Smash
12% of 2982 decks
+9% synergy
Dovin's Veto
11% of 481 decks
-8% synergy
Memory's Journey
11% of 3390 decks
+11% synergy
Dark Ritual
11% of 1303 decks
-11% synergy
Moonmist
11% of 11918 decks
+10% synergy
Enlightened Tutor
11% of 1582 decks
-7% synergy
Rakdos Charm
11% of 1291 decks
-4% synergy
Harrow
11% of 11934 decks
+1% synergy
Brain Freeze
10% of 3394 decks
+7% synergy
Crop Rotation
10% of 11934 decks
+0% synergy
Noxious Revival
10% of 11921 decks
+4% synergy
Saw It Coming
10% of 3340 decks
+8% synergy
Signature Slam
10% of 4177 decks
+9% synergy
Dawn's Truce
10% of 223 decks
-6% synergy
Sorceries
Farseek
30% of 11934 decks
-4% synergy
Vandalblast
28% of 11916 decks
+12% synergy
Three Visits
23% of 11934 decks
-2% synergy
Decimate
22% of 11934 decks
+14% synergy
Faithless Looting
22% of 11917 decks
+5% synergy
Felling Blow
21% of 33 decks
+7% synergy
Deluge of Doom
20% of 69 decks
+18% synergy
Preposterous Proportions
16% of 287 decks
+9% synergy
Demonic Tutor
16% of 1303 decks
-6% synergy
Explore
15% of 11922 decks
+6% synergy
Buried Alive
15% of 1303 decks
+9% synergy
Reanimate
15% of 1303 decks
-1% synergy
Windfall
14% of 3394 decks
+1% synergy
Hull Breach
14% of 11934 decks
+9% synergy
Dread Return
14% of 1303 decks
+8% synergy
Unburial Rites
13% of 432 decks
+11% synergy
Shamanic Revelation
13% of 11907 decks
+4% synergy
Harmonize
12% of 11932 decks
+3% synergy
Deep Analysis
12% of 3394 decks
+10% synergy
Jeska's Will
11% of 11785 decks
-6% synergy
Release the Dogs
11% of 1546 decks
+11% synergy
Stump Stomp
11% of 4356 decks
+2% synergy
Anzrag's Rampage
10% of 5473 decks
+9% synergy
Red Sun's Twilight
10% of 9521 decks
+9% synergy
Convert to Slime
10% of 69 decks
+4% synergy
Toxic Deluge
10% of 1288 decks
-7% synergy
Unmarked Grave
10% of 1234 decks
+7% synergy
Bala Ged Recovery
10% of 11794 decks
+1% synergy
Victimize
9% of 1303 decks
-2% synergy
Unnatural Moonrise
9% of 11669 decks
+9% synergy
Rishkar's Expertise
9% of 11893 decks
-1% synergy
Echo of Eons
8% of 3373 decks
+7% synergy
Summer Bloom
8% of 11934 decks
+7% synergy
Escape to the Wilds
8% of 11846 decks
+4% synergy
Austere Command
8% of 1581 decks
-5% synergy
Damnation
8% of 1302 decks
-0% synergy
Maelstrom Pulse
8% of 1293 decks
+6% synergy
Overwhelming Stampede
8% of 11922 decks
+2% synergy
Culling Ritual
8% of 1235 decks
-4% synergy
Worldsoul's Rage
7% of 5473 decks
+4% synergy
Season of Gathering
7% of 2378 decks
+3% synergy
Croaking Counterpart
7% of 3305 decks
+6% synergy
Waltz of Rage
7% of 700 decks
+4% synergy
Life from the Loam
7% of 11934 decks
+4% synergy
Rootcast Apprenticeship
7% of 1366 decks
+2% synergy
Wrath of God
7% of 1582 decks
+1% synergy
Skyshroud Claim
7% of 11934 decks
-2% synergy
Farewell
7% of 1481 decks
-6% synergy
Fade from History
7% of 10330 decks
+6% synergy
Lively Dirge
7% of 424 decks
+4% synergy
Utility Artifacts
Swiftfoot Boots
27% of 11920 decks
-1% synergy
Lightning Greaves
20% of 11936 decks
-5% synergy
Liquimetal Coating
16% of 11924 decks
+15% synergy
Conduit of Worlds
14% of 9608 decks
+7% synergy
Ozolith, the Shattered Spire
13% of 8733 decks
+6% synergy
Monkey Cage
13% of 11936 decks
+12% synergy
Tarrian's Soulcleaver
10% of 6571 decks
+8% synergy
Crucible of Worlds
10% of 11936 decks
+7% synergy
Maskwood Nexus
10% of 11758 decks
+7% synergy
Sting, the Glinting Dagger
10% of 7598 decks
+8% synergy
Herald's Horn
9% of 11887 decks
+2% synergy
The Ozolith
7% of 11822 decks
+4% synergy
Mycosynth Lattice
7% of 11936 decks
+6% synergy
The Great Henge
7% of 11846 decks
-3% synergy
Banner of Kinship
7% of 287 decks
-6% synergy
Idol of Oblivion
7% of 11852 decks
+2% synergy
Vanquisher's Banner
6% of 11886 decks
+2% synergy
Lifecrafter's Bestiary
6% of 11893 decks
+2% synergy
Short Bow
6% of 1295 decks
+4% synergy
Library of Leng
6% of 11936 decks
+5% synergy
Currency Converter
6% of 11190 decks
+5% synergy
Bag of Holding
5% of 11860 decks
+5% synergy
Ensnaring Bridge
5% of 11936 decks
+5% synergy
Ghirapur Orrery
5% of 11896 decks
+4% synergy
Enchantments
Rhythm of the Wild
29% of 11871 decks
+6% synergy
Amphibian Downpour
23% of 2155 decks
+19% synergy
Felidar Retreat
22% of 1545 decks
+14% synergy
Ripples of Undeath
21% of 337 decks
+15% synergy
Viridian Revel
21% of 11922 decks
+20% synergy
Case of the Locked Hothouse
21% of 5528 decks
+17% synergy
Hardened Scales
20% of 11907 decks
+11% synergy
Caretaker's Talent
17% of 175 decks
+5% synergy
Garruk's Uprising
15% of 11810 decks
+0% synergy
Annie Joins Up
14% of 474 decks
-4% synergy
Valakut Exploration
14% of 11795 decks
+12% synergy
Invigorating Hot Spring
14% of 11297 decks
+11% synergy
Anointed Procession
14% of 1572 decks
+5% synergy
Unnatural Growth
13% of 11669 decks
+8% synergy
Restricted Office // Lecture Hall
13% of 23 decks
+3% synergy
Leyline of the Guildpact
13% of 109 decks
-10% synergy
Exploration
13% of 11934 decks
+4% synergy
Mirari's Wake
11% of 1581 decks
-2% synergy
Animate Dead
11% of 1303 decks
+2% synergy
Full Moon's Rise
11% of 11918 decks
+11% synergy
Howlpack Resurgence
11% of 11899 decks
+11% synergy
Ominous Seas
11% of 3361 decks
+8% synergy
Curse of Opulence
11% of 11886 decks
+7% synergy
Warleader's Call
10% of 591 decks
-0% synergy
The Lost and the Damned
10% of 3115 decks
+8% synergy
Wild Growth
10% of 11934 decks
-1% synergy
Howling Moon
10% of 11589 decks
+9% synergy
Wild Wasteland
10% of 5108 decks
+9% synergy
Beastmaster Ascension
10% of 11922 decks
+4% synergy
Phyrexian Arena
10% of 1303 decks
-5% synergy
Abundance
9% of 11934 decks
+7% synergy
Dazzling Theater // Prop Room
9% of 86 decks
-11% synergy
Aura Shards
9% of 1581 decks
+0% synergy
Descent into Avernus
9% of 11005 decks
+5% synergy
Insidious Roots
9% of 464 decks
+0% synergy
Intangible Virtue
9% of 1581 decks
+4% synergy
Glasswing Grace
9% of 81 decks
+5% synergy
Smothering Tithe
8% of 1567 decks
-16% synergy
Rhystic Study
8% of 3394 decks
-19% synergy
Colossal Majesty
8% of 11877 decks
+4% synergy
Tribute to the World Tree
8% of 9021 decks
-1% synergy
Doubling Season
7% of 11934 decks
-2% synergy
Underworld Breach
7% of 11837 decks
+1% synergy
Primal Vigor
7% of 11908 decks
+4% synergy
Sylvan Library
7% of 11934 decks
-5% synergy
Druid Class
7% of 11693 decks
+4% synergy
Guardian Project
7% of 11871 decks
-2% synergy
Rest in Peace
7% of 1580 decks
+5% synergy
Well Rested
7% of 5191 decks
+5% synergy
Utopia Sprawl
7% of 11934 decks
-1% synergy
Planeswalkers
Arlinn, the Pack's Hope
10% of 11669 decks
+9% synergy
Arlinn Kord
8% of 11899 decks
+7% synergy
Ral, Crackling Wit
8% of 1181 decks
-0% synergy
Jace, Wielder of Mysteries
8% of 3375 decks
+4% synergy
Grist, the Hunger Tide
7% of 1233 decks
+4% synergy
Comet, Stellar Pup
7% of 1270 decks
+6% synergy
Ajani, the Greathearted
5% of 1562 decks
+2% synergy
Xenagos, the Reveler
5% of 11909 decks
+3% synergy
Domri, Anarch of Bolas
5% of 11867 decks
+2% synergy
Utility Lands
Kessig Wolf Run
31% of 11918 decks
+15% synergy
Rogue's Passage
21% of 11917 decks
+1% synergy
Shifting Woodland
20% of 4356 decks
+10% synergy
Bojuka Bog
19% of 1294 decks
-12% synergy
Yavimaya, Cradle of Growth
17% of 11729 decks
+8% synergy
Reliquary Tower
17% of 11930 decks
-13% synergy
Otawara, Soaring City
16% of 3274 decks
-1% synergy
Boseiju, Who Endures
15% of 11297 decks
-4% synergy
Treetop Village
13% of 11934 decks
+12% synergy
Mosswort Bridge
13% of 11929 decks
+3% synergy
Gavony Township
13% of 1580 decks
+3% synergy
Skarrg, the Rage Pits
12% of 11934 decks
+9% synergy
Dakmor Salvage
12% of 1302 decks
+10% synergy
Takenuma, Abandoned Mire
10% of 1196 decks
-0% synergy
Temple of the False God
10% of 11936 decks
+1% synergy
Mystic Sanctuary
9% of 3367 decks
-3% synergy
Three Tree City
7% of 2541 decks
-2% synergy
Arena of Glory
7% of 3802 decks
-2% synergy
Alchemist's Refuge
6% of 3388 decks
-1% synergy
Oboro, Palace in the Clouds
6% of 3394 decks
+5% synergy
Castle Embereth
6% of 11847 decks
+2% synergy
Cephalid Coliseum
6% of 3394 decks
+3% synergy
Lonely Sandbar
6% of 3394 decks
+2% synergy
Field of the Dead
6% of 11860 decks
+2% synergy
Desert of the True
6% of 1572 decks
+4% synergy
Shefet Dunes
5% of 1572 decks
+5% synergy
Barren Moor
5% of 1303 decks
+1% synergy
Tranquil Thicket
5% of 11934 decks
+1% synergy
Mana Artifacts
Sol Ring
78% of 11936 decks
-6% synergy
Arcane Signet
63% of 11848 decks
-9% synergy
Gruul Signet
24% of 11934 decks
+12% synergy
Liquimetal Torque
20% of 11729 decks
+16% synergy
Haunted Screen
14% of 22 decks
+6% synergy
Commander's Sphere
12% of 11909 decks
-3% synergy
Selesnya Signet
12% of 1581 decks
+3% synergy
Talisman of Curiosity
11% of 3373 decks
-1% synergy
The Celestus
11% of 11671 decks
+11% synergy
Rakdos Signet
11% of 1303 decks
-18% synergy
Talisman of Impulse
11% of 11934 decks
+2% synergy
Golgari Signet
11% of 1302 decks
-2% synergy
Boros Signet
10% of 1581 decks
-13% synergy
Talisman of Resilience
10% of 1278 decks
-2% synergy
Patchwork Banner
10% of 2154 decks
-0% synergy
Simic Signet
9% of 3394 decks
-5% synergy
Talisman of Creativity
9% of 3373 decks
-20% synergy
Izzet Signet
9% of 3394 decks
-19% synergy
Fellwar Stone
9% of 11936 decks
-12% synergy
Timeless Lotus
8% of 322 decks
-6% synergy
Patriar's Seal
8% of 11006 decks
+6% synergy
Talisman of Indulgence
8% of 1303 decks
-19% synergy
Talisman of Unity
6% of 1581 decks
-1% synergy
Talisman of Conviction
6% of 1561 decks
-17% synergy
Dimir Signet
5% of 461 decks
-24% synergy
Chromatic Lantern
5% of 11917 decks
-4% synergy
Thought Vessel
5% of 11902 decks
-12% synergy
Phial of Galadriel
5% of 7795 decks
+4% synergy
Lands
Command Tower
84% of 11921 decks
+10% synergy
Bountiful Landscape
55% of 1977 decks
+40% synergy
Cinder Glade
54% of 11902 decks
+16% synergy
Frontier Bivouac
47% of 3382 decks
+20% synergy
Ketria Triome
43% of 3361 decks
+11% synergy
Breeding Pool
43% of 3394 decks
+2% synergy
Steam Vents
42% of 3394 decks
+3% synergy
Jungle Shrine
41% of 1580 decks
+9% synergy
Rootbound Crag
40% of 11922 decks
+16% synergy
Stomping Ground
40% of 11934 decks
-2% synergy
Rockfall Vale
39% of 11669 decks
+17% synergy
Hinterland Harbor
39% of 3390 decks
+12% synergy
Sulfur Falls
36% of 3390 decks
+6% synergy
Jetmir's Garden
36% of 1465 decks
+3% synergy
Overgrown Tomb
36% of 1302 decks
-7% synergy
Blood Crypt
34% of 1303 decks
-5% synergy
Gruul Turf
34% of 11934 decks
+18% synergy
Ziatora's Proving Ground
34% of 1183 decks
+2% synergy
Rejuvenating Springs
33% of 3350 decks
+4% synergy
Game Trail
32% of 11899 decks
+17% synergy
Exotic Orchard
32% of 11930 decks
-4% synergy
Temple Garden
32% of 1581 decks
-9% synergy
Yavimaya Coast
31% of 3394 decks
+4% synergy
Dreamroot Cascade
30% of 3284 decks
+12% synergy
Path of Ancestry
30% of 11887 decks
+9% synergy
Training Center
30% of 3350 decks
+2% synergy
Savage Lands
29% of 1299 decks
+6% synergy
Canopy Vista
29% of 1574 decks
-7% synergy
Spire Garden
29% of 11877 decks
+5% synergy
Twisted Landscape
29% of 321 decks
+9% synergy
Evolving Wilds
28% of 11924 decks
+7% synergy
Sacred Foundry
28% of 1581 decks
-8% synergy
Simic Growth Chamber
28% of 3394 decks
+8% synergy
Temple of Abandon
27% of 11909 decks
+13% synergy
Shivan Reef
27% of 3394 decks
-0% synergy
Wooded Foothills
24% of 11936 decks
+14% synergy
Karplusan Forest
24% of 11934 decks
+7% synergy
Zagoth Triome
23% of 443 decks
-8% synergy
Thornspire Verge
23% of 1198 decks
+4% synergy
Smoldering Marsh
22% of 1286 decks
-10% synergy
Izzet Boilerworks
22% of 3394 decks
+6% synergy
Watery Grave
22% of 461 decks
-19% synergy
Hallowed Fountain
22% of 489 decks
-19% synergy
Hedge Maze
22% of 2515 decks
+8% synergy
Indatha Triome
21% of 415 decks
-10% synergy
Sunpetal Grove
21% of 1580 decks
-2% synergy
Clifftop Retreat
21% of 1580 decks
-8% synergy
Spara's Headquarters
21% of 429 decks
-11% synergy
Dragonskull Summit
20% of 1294 decks
-11% synergy
Mossfire Valley
20% of 11934 decks
+9% synergy