Karlach, Fury of Avernus // Sword Coast Sailor (Commander) - Optimized Aggro

Karlach, Fury of Avernus // Sword Coast Sailor
Rank #1,149
7decks
Background image for Ghost-Spider, Gwen Stacy Commander Deck Tech
Landon Crispens
Sep 22, 2025
Ghost-Spider, Gwen Stacy Commander Deck Tech
If you want to build a monored Commander deck, and all you want to do is make large armies to attack, Ghost-Spider, Gwen Stacy is your gal.
Deck Filters
Archidekt
Commander Spellbook
Moxfield
Scryfall
MTGStocks
Hexing Squelcher
33%inclusion1 decks3 decks
23%synergy
High Synergy Cards
Aggravated Assault
71%inclusion5 decks7 decks
70%synergy
Kediss, Emberclaw Familiar
71%inclusion5 decks7 decks
69%synergy
Arena of Glory
71%inclusion5 decks7 decks
67%synergy
Moraug, Fury of Akoum
57%inclusion4 decks7 decks
57%synergy
Two-Handed Axe
57%inclusion4 decks7 decks
56%synergy
Combat Celebrant
57%inclusion4 decks7 decks
56%synergy
Seize the Day
57%inclusion4 decks7 decks
55%synergy
Time Warp
57%inclusion4 decks7 decks
54%synergy
Etali, Primal Storm
57%inclusion4 decks7 decks
52%synergy
Ragavan, Nimble Pilferer
57%inclusion4 decks7 decks
48%synergy
Top Cards
An Offer You Can't Refuse
57%inclusion4 decks7 decks
21%synergy
Mystic Remora
57%inclusion4 decks7 decks
37%synergy
Deflecting Swat
57%inclusion4 decks7 decks
37%synergy
Swiftfoot Boots
57%inclusion4 decks7 decks
28%synergy
Counterspell
57%inclusion4 decks7 decks
5%synergy
Game Changers
Jeska's Will
71%inclusion5 decks7 decks
42%synergy
Fierce Guardianship
71%inclusion5 decks7 decks
50%synergy
Rhystic Study
57%inclusion4 decks7 decks
32%synergy
Cyclonic Rift
57%inclusion4 decks7 decks
32%synergy
Ancient Tomb
43%inclusion3 decks7 decks
32%synergy
The One Ring
43%inclusion3 decks7 decks
33%synergy
Gamble
43%inclusion3 decks7 decks
25%synergy
Chrome Mox
43%inclusion3 decks7 decks
33%synergy
Mana Vault
29%inclusion2 decks7 decks
20%synergy
Force of Will
29%inclusion2 decks7 decks
16%synergy
Creatures
Professional Face-Breaker
43%inclusion3 decks7 decks
38%synergy
Elturel Survivors
43%inclusion3 decks7 decks
43%synergy
Goldspan Dragon
43%inclusion3 decks7 decks
39%synergy
Lizard Blades
43%inclusion3 decks7 decks
42%synergy
Hoarding Ogre
43%inclusion3 decks7 decks
41%synergy
Scourge of the Throne
29%inclusion2 decks7 decks
27%synergy
Ancient Copper Dragon
29%inclusion2 decks7 decks
26%synergy
Port Razer
29%inclusion2 decks7 decks
27%synergy
Delina, Wild Mage
29%inclusion2 decks7 decks
26%synergy
Enduring Curiosity
29%inclusion2 decks7 decks
26%synergy
Bloodsworn Steward
29%inclusion2 decks7 decks
28%synergy
Lighthouse Chronologist
29%inclusion2 decks7 decks
28%synergy
Neheb, the Eternal
29%inclusion2 decks7 decks
27%synergy
Esior, Wardwing Familiar
29%inclusion2 decks7 decks
28%synergy
Loyal Drake
29%inclusion2 decks7 decks
28%synergy
Spellskite
29%inclusion2 decks7 decks
23%synergy
Kavaron Turbodrone
20%inclusion1 decks5 decks
20%synergy
Zookeeper Mechan
20%inclusion1 decks5 decks
19%synergy
The Emperor of Palamecia
17%inclusion1 decks6 decks
12%synergy
Vivi Ornitier
17%inclusion1 decks6 decks
6%synergy
Drakuseth, Maw of Flames
14%inclusion1 decks7 decks
12%synergy
Xorn
14%inclusion1 decks7 decks
12%synergy
Zephyr Singer
14%inclusion1 decks7 decks
14%synergy
Oliphaunt
14%inclusion1 decks7 decks
13%synergy
Dalakos, Crafter of Wonders
14%inclusion1 decks7 decks
14%synergy
Captain Lannery Storm
14%inclusion1 decks7 decks
12%synergy
Balthor the Stout
14%inclusion1 decks7 decks
14%synergy
Stirring Bard
14%inclusion1 decks7 decks
14%synergy
Snapcaster Mage
14%inclusion1 decks7 decks
11%synergy
Consecrated Sphinx
14%inclusion1 decks7 decks
11%synergy
Crashing Drawbridge
14%inclusion1 decks7 decks
14%synergy
Phyrexian Metamorph
14%inclusion1 decks7 decks
8%synergy
Trailblazing Historian
14%inclusion1 decks7 decks
14%synergy
K-9, Mark I
14%inclusion1 decks7 decks
14%synergy
Simian Spirit Guide
14%inclusion1 decks7 decks
4%synergy
Tomb of Horrors Adventurer
14%inclusion1 decks7 decks
14%synergy
Hydroelectric Specimen
14%inclusion1 decks7 decks
7%synergy
Siren Stormtamer
14%inclusion1 decks7 decks
10%synergy
Urabrask the Hidden
14%inclusion1 decks7 decks
14%synergy
Komainu Battle Armor
14%inclusion1 decks7 decks
13%synergy
Alania, Divergent Storm
14%inclusion1 decks7 decks
10%synergy
Balor
14%inclusion1 decks7 decks
14%synergy
Gilded Drake
14%inclusion1 decks7 decks
13%synergy
Death-Greeter's Champion
14%inclusion1 decks7 decks
14%synergy
Archmage Emeritus
14%inclusion1 decks7 decks
-20%synergy
Neera, Wild Mage
14%inclusion1 decks7 decks
12%synergy
Spark Double
14%inclusion1 decks7 decks
9%synergy
Ancient Silver Dragon
14%inclusion1 decks7 decks
12%synergy
Hideous Taskmaster
14%inclusion1 decks7 decks
14%synergy
Cavern-Hoard Dragon
14%inclusion1 decks7 decks
13%synergy
Instants
Chaos Warp
43%inclusion3 decks7 decks
1%synergy
Thrill of Possibility
43%inclusion3 decks7 decks
29%synergy
Seething Song
43%inclusion3 decks7 decks
24%synergy
Mana Drain
43%inclusion3 decks7 decks
26%synergy
Rapid Hybridization
29%inclusion2 decks7 decks
11%synergy
Untimely Malfunction
29%inclusion2 decks7 decks
20%synergy
Negate
29%inclusion2 decks7 decks
-5%synergy
Brainstorm
29%inclusion2 decks7 decks
-15%synergy
Stubborn Denial
29%inclusion2 decks7 decks
26%synergy
Lightning Bolt
29%inclusion2 decks7 decks
0%synergy
Swan Song
29%inclusion2 decks7 decks
7%synergy
Bolt Bend
29%inclusion2 decks7 decks
25%synergy
Pact of Negation
29%inclusion2 decks7 decks
19%synergy
Prismari Command
29%inclusion2 decks7 decks
12%synergy
Valakut Awakening
29%inclusion2 decks7 decks
19%synergy
Consult the Star Charts
20%inclusion1 decks5 decks
18%synergy
Redirect Lightning
20%inclusion1 decks5 decks
15%synergy
Hide on the Ceiling
20%inclusion1 decks5 decks
19%synergy
Pongify
14%inclusion1 decks7 decks
-13%synergy
See Double
14%inclusion1 decks7 decks
13%synergy
Chain of Vapor
14%inclusion1 decks7 decks
9%synergy
Run Away Together
14%inclusion1 decks7 decks
10%synergy
Three Steps Ahead
14%inclusion1 decks7 decks
10%synergy
Temur Battle Rage
14%inclusion1 decks7 decks
10%synergy
Wild Magic Surge
14%inclusion1 decks7 decks
11%synergy
Flare of Denial
14%inclusion1 decks7 decks
12%synergy
Unexpected Windfall
14%inclusion1 decks7 decks
0%synergy
Siege Smash
14%inclusion1 decks7 decks
13%synergy
Unleash Fury
14%inclusion1 decks7 decks
13%synergy
Invert Polarity
14%inclusion1 decks7 decks
2%synergy
Nexus of Fate
14%inclusion1 decks7 decks
12%synergy
Reality Shift
14%inclusion1 decks7 decks
1%synergy
Capsize
14%inclusion1 decks7 decks
13%synergy
Gale's Redirection
14%inclusion1 decks7 decks
13%synergy
Savage Beating
14%inclusion1 decks7 decks
14%synergy
Flusterstorm
14%inclusion1 decks7 decks
2%synergy
Final Fortune
14%inclusion1 decks7 decks
11%synergy
Twinferno
14%inclusion1 decks7 decks
10%synergy
Delayed Blast Fireball
14%inclusion1 decks7 decks
11%synergy
Izzet Charm
14%inclusion1 decks7 decks
-5%synergy
Big Score
14%inclusion1 decks7 decks
-9%synergy
Rebel Salvo
14%inclusion1 decks7 decks
14%synergy
Force of Negation
14%inclusion1 decks7 decks
4%synergy
Arcane Denial
14%inclusion1 decks7 decks
-15%synergy
Sazacap's Brew
14%inclusion1 decks7 decks
13%synergy
Great Train Heist
14%inclusion1 decks7 decks
12%synergy
Sink into Stupor
14%inclusion1 decks7 decks
-3%synergy
Blazing Shoal
14%inclusion1 decks7 decks
14%synergy
Mystic Confluence
14%inclusion1 decks7 decks
10%synergy
Narset's Reversal
14%inclusion1 decks7 decks
6%synergy
Sorceries
Vandalblast
43%inclusion3 decks7 decks
16%synergy
Eagle Vision
43%inclusion3 decks7 decks
42%synergy
Ponder
29%inclusion2 decks7 decks
-10%synergy
Faithless Looting
29%inclusion2 decks7 decks
-5%synergy
Sea Gate Restoration
29%inclusion2 decks7 decks
20%synergy
Temporal Manipulation
29%inclusion2 decks7 decks
27%synergy
Shatterskull Smashing
29%inclusion2 decks7 decks
24%synergy
Blasphemous Act
29%inclusion2 decks7 decks
-10%synergy
Capture of Jingzhou
29%inclusion2 decks7 decks
27%synergy
Expressive Iteration
29%inclusion2 decks7 decks
6%synergy
Relentless Assault
29%inclusion2 decks7 decks
27%synergy
Overpowering Attack
29%inclusion2 decks7 decks
28%synergy
Systems Override
20%inclusion1 decks5 decks
20%synergy
Chart a Course
14%inclusion1 decks7 decks
10%synergy
Gitaxian Probe
14%inclusion1 decks7 decks
-7%synergy
Inspired Tinkering
14%inclusion1 decks7 decks
11%synergy
Full Throttle
14%inclusion1 decks7 decks
12%synergy
Mizzix's Mastery
14%inclusion1 decks7 decks
-5%synergy
Fabricate
14%inclusion1 decks7 decks
6%synergy
Fanged Flames
14%inclusion1 decks7 decks
14%synergy
Temporal Mastery
14%inclusion1 decks7 decks
13%synergy
Dance with Calamity
14%inclusion1 decks7 decks
13%synergy
Lórien Revealed
14%inclusion1 decks7 decks
8%synergy
Pirate's Pillage
14%inclusion1 decks7 decks
8%synergy
By Force
14%inclusion1 decks7 decks
14%synergy
Beacon of Tomorrows
14%inclusion1 decks7 decks
13%synergy
Rite of Flame
14%inclusion1 decks7 decks
5%synergy
Surge to Victory
14%inclusion1 decks7 decks
11%synergy
Disrupt Decorum
14%inclusion1 decks7 decks
11%synergy
Bloody Betrayal
14%inclusion1 decks7 decks
14%synergy
Mana Geyser
14%inclusion1 decks7 decks
-6%synergy
Expropriate
14%inclusion1 decks7 decks
12%synergy
Worldfire
14%inclusion1 decks7 decks
14%synergy
Furnace Reins
14%inclusion1 decks7 decks
14%synergy
Spectacular Showdown
14%inclusion1 decks7 decks
13%synergy
Alrund's Epiphany
14%inclusion1 decks7 decks
13%synergy
Temporal Trespass
14%inclusion1 decks7 decks
13%synergy
Solve the Equation
14%inclusion1 decks7 decks
1%synergy
Reckless Handling
14%inclusion1 decks7 decks
13%synergy
Winds of Change
14%inclusion1 decks7 decks
11%synergy
Chandra's Ignition
14%inclusion1 decks7 decks
7%synergy
Utility Artifacts
The Reaver Cleaver
43%inclusion3 decks7 decks
40%synergy
Mithril Coat
43%inclusion3 decks7 decks
39%synergy
Embercleave
43%inclusion3 decks7 decks
41%synergy
Sword of Wealth and Power
43%inclusion3 decks7 decks
42%synergy
Commander's Plate
43%inclusion3 decks7 decks
39%synergy
Sword of the Animist
43%inclusion3 decks7 decks
41%synergy
Buster Sword
33%inclusion2 decks6 decks
33%synergy
Wayfarer's Bauble
29%inclusion2 decks7 decks
18%synergy
Diamond Pick-Axe
29%inclusion2 decks7 decks
27%synergy
The Key to the Vault
29%inclusion2 decks7 decks
27%synergy
Lightning Greaves
29%inclusion2 decks7 decks
5%synergy
Sword of Feast and Famine
29%inclusion2 decks7 decks
27%synergy
Dolmen Gate
29%inclusion2 decks7 decks
28%synergy
Blackblade Reforged
29%inclusion2 decks7 decks
27%synergy
Basilisk Collar
29%inclusion2 decks7 decks
20%synergy
The Endstone
20%inclusion1 decks5 decks
19%synergy
Beamtown Beatstick
14%inclusion1 decks7 decks
13%synergy
Voltaic Key
14%inclusion1 decks7 decks
13%synergy
Pip-Boy 3000
14%inclusion1 decks7 decks
14%synergy
Umezawa's Jitte
14%inclusion1 decks7 decks
14%synergy
Sword of Fire and Ice
14%inclusion1 decks7 decks
14%synergy
Manifold Key
14%inclusion1 decks7 decks
13%synergy
Thran Power Suit
14%inclusion1 decks7 decks
14%synergy
Vexing Bauble
14%inclusion1 decks7 decks
13%synergy
Leyline Axe
14%inclusion1 decks7 decks
14%synergy
Deluxe Dragster
14%inclusion1 decks7 decks
14%synergy
Bitterthorn, Nissa's Animus
14%inclusion1 decks7 decks
14%synergy
Lavaspur Boots
14%inclusion1 decks7 decks
13%synergy
Urabrask's Forge
14%inclusion1 decks7 decks
14%synergy
Helm of the Host
14%inclusion1 decks7 decks
12%synergy
Barrow-Blade
14%inclusion1 decks7 decks
14%synergy
Shadowspear
14%inclusion1 decks7 decks
11%synergy
Ramosian Greatsword
14%inclusion1 decks7 decks
14%synergy
Sword of Hearth and Home
14%inclusion1 decks7 decks
14%synergy
Barbed Batterfist
14%inclusion1 decks7 decks
14%synergy
Excalibur, Sword of Eden
14%inclusion1 decks7 decks
13%synergy
Transmutation Font
14%inclusion1 decks7 decks
14%synergy
Sword of Hours
14%inclusion1 decks7 decks
13%synergy
Inquisitor's Flail
14%inclusion1 decks7 decks
14%synergy
Kitesail
14%inclusion1 decks7 decks
14%synergy
Hexgold Halberd
14%inclusion1 decks7 decks
14%synergy
Sword of Forge and Frontier
14%inclusion1 decks7 decks
14%synergy
Cloak of the Bat
14%inclusion1 decks7 decks
14%synergy
Grafted Exoskeleton
14%inclusion1 decks7 decks
13%synergy
Enchantments
City on Fire
43%inclusion3 decks7 decks
40%synergy
Rising of the Day
29%inclusion2 decks7 decks
27%synergy
Guild Artisan
29%inclusion2 decks7 decks
27%synergy
Stranglehold
29%inclusion2 decks7 decks
28%synergy
Combat Research
29%inclusion2 decks7 decks
27%synergy
Firebender Ascension
25%inclusion1 decks4 decks
25%synergy
Super State
20%inclusion1 decks5 decks
20%synergy
Curse of Hospitality
14%inclusion1 decks7 decks
14%synergy
Descent into Avernus
14%inclusion1 decks7 decks
12%synergy
Aqueous Form
14%inclusion1 decks7 decks
12%synergy
Psychic Impetus
14%inclusion1 decks7 decks
13%synergy
Fiery Emancipation
14%inclusion1 decks7 decks
12%synergy
Gratuitous Violence
14%inclusion1 decks7 decks
13%synergy
Tavern Brawler
14%inclusion1 decks7 decks
14%synergy
Astral Wingspan
14%inclusion1 decks7 decks
14%synergy
Shiny Impetus
14%inclusion1 decks7 decks
12%synergy
Fable of the Mirror-Breaker
14%inclusion1 decks7 decks
13%synergy
Wingspan Stride
14%inclusion1 decks7 decks
14%synergy
Frostcliff Siege
14%inclusion1 decks7 decks
11%synergy
Propaganda
14%inclusion1 decks7 decks
-1%synergy
Rain of Riches
14%inclusion1 decks7 decks
13%synergy
Sticky Fingers
14%inclusion1 decks7 decks
13%synergy
Battles
Invasion of Kamigawa
14%inclusion1 decks7 decks
14%synergy
Planeswalkers
Jeska, Thrice Reborn
43%inclusion3 decks7 decks
42%synergy
Chandra, Flamecaller
14%inclusion1 decks7 decks
14%synergy
Koth, Fire of Resistance
14%inclusion1 decks7 decks
14%synergy
The Royal Scions
14%inclusion1 decks7 decks
13%synergy
Utility Lands
Otawara, Soaring City
57%inclusion4 decks7 decks
39%synergy
Rogue's Passage
43%inclusion3 decks7 decks
29%synergy
Fire Nation Palace
25%inclusion1 decks4 decks
23%synergy
Agna Qel'a
25%inclusion1 decks4 decks
23%synergy
Secluded Starforge
20%inclusion1 decks5 decks
19%synergy
Witch's Clinic
14%inclusion1 decks7 decks
13%synergy
Restless Spire
14%inclusion1 decks7 decks
9%synergy
Hanweir Battlements
14%inclusion1 decks7 decks
14%synergy
Minamo, School at Water's Edge
14%inclusion1 decks7 decks
10%synergy
Rivendell
14%inclusion1 decks7 decks
11%synergy
Mistrise Village
14%inclusion1 decks7 decks
-1%synergy
Treasure Vault
14%inclusion1 decks7 decks
11%synergy
Urza's Saga
14%inclusion1 decks7 decks
6%synergy
Mines of Moria
14%inclusion1 decks7 decks
12%synergy
Oboro, Palace in the Clouds
14%inclusion1 decks7 decks
14%synergy
Inkmoth Nexus
14%inclusion1 decks7 decks
14%synergy
Command Beacon
14%inclusion1 decks7 decks
11%synergy
Nykthos, Shrine to Nyx
14%inclusion1 decks7 decks
14%synergy
Castle Embereth
14%inclusion1 decks7 decks
12%synergy
Field of the Dead
14%inclusion1 decks7 decks
14%synergy
Reliquary Tower
14%inclusion1 decks7 decks
-35%synergy
Strip Mine
14%inclusion1 decks7 decks
13%synergy
Bonders' Enclave
14%inclusion1 decks7 decks
14%synergy
Den of the Bugbear
14%inclusion1 decks7 decks
14%synergy
Mana Artifacts
Sol Ring
86%inclusion6 decks7 decks
-1%synergy
Arcane Signet
57%inclusion4 decks7 decks
-26%synergy
Izzet Signet
57%inclusion4 decks7 decks
-2%synergy
Talisman of Creativity
43%inclusion3 decks7 decks
-11%synergy
Fellwar Stone
29%inclusion2 decks7 decks
-3%synergy
Mox Opal
29%inclusion2 decks7 decks
21%synergy
All-Fates Scroll
20%inclusion1 decks5 decks
19%synergy
Lotus Petal
14%inclusion1 decks7 decks
1%synergy
Heraldic Banner
14%inclusion1 decks7 decks
13%synergy
The Aetherspark
14%inclusion1 decks7 decks
14%synergy
Patchwork Banner
14%inclusion1 decks7 decks
12%synergy
Mox Amber
14%inclusion1 decks7 decks
5%synergy
Fire Diamond
14%inclusion1 decks7 decks
6%synergy
Gilded Lotus
14%inclusion1 decks7 decks
8%synergy
Thought Vessel
14%inclusion1 decks7 decks
-22%synergy
Thran Dynamo
14%inclusion1 decks7 decks
6%synergy
Mind Stone
14%inclusion1 decks7 decks
-10%synergy
Misleading Signpost
14%inclusion1 decks7 decks
13%synergy
Lands
Mountain
100%inclusion7 decks7 decks
3%synergy
Island
100%inclusion7 decks7 decks
2%synergy
Steam Vents
86%inclusion6 decks7 decks
38%synergy
Command Tower
71%inclusion5 decks7 decks
-16%synergy
Training Center
71%inclusion5 decks7 decks
28%synergy
Sulfur Falls
57%inclusion4 decks7 decks
-9%synergy
Cascade Bluffs
57%inclusion4 decks7 decks
14%synergy
Shivan Reef
43%inclusion3 decks7 decks
-16%synergy
Stormcarved Coast
43%inclusion3 decks7 decks
2%synergy
Riverglide Pathway
43%inclusion3 decks7 decks
19%synergy
Riverpyre Verge
43%inclusion3 decks7 decks
22%synergy
Scalding Tarn
43%inclusion3 decks7 decks
12%synergy
Prismatic Vista
29%inclusion2 decks7 decks
22%synergy
Misty Rainforest
29%inclusion2 decks7 decks
18%synergy
Izzet Boilerworks
29%inclusion2 decks7 decks
-10%synergy
Sea Gate Restoration
29%inclusion2 decks7 decks
20%synergy
Wooded Foothills
29%inclusion2 decks7 decks
20%synergy
Frostboil Snarl
29%inclusion2 decks7 decks
-15%synergy
Shatterskull Smashing
29%inclusion2 decks7 decks
24%synergy
Plaza of Heroes
29%inclusion2 decks7 decks
27%synergy
Evolving Wilds
29%inclusion2 decks7 decks
11%synergy
Arid Mesa
29%inclusion2 decks7 decks
19%synergy
Volcanic Island
29%inclusion2 decks7 decks
13%synergy
Thundering Falls
29%inclusion2 decks7 decks
8%synergy
Polluted Delta
29%inclusion2 decks7 decks
17%synergy
Flooded Strand
29%inclusion2 decks7 decks
17%synergy
Bloodstained Mire
29%inclusion2 decks7 decks
19%synergy
Valakut Awakening
29%inclusion2 decks7 decks
19%synergy
Command Bridge
20%inclusion1 decks5 decks
19%synergy
Fiery Islet
14%inclusion1 decks7 decks
-12%synergy
Cliffgate
14%inclusion1 decks7 decks
14%synergy
Myriad Landscape
14%inclusion1 decks7 decks
-2%synergy
Swiftwater Cliffs
14%inclusion1 decks7 decks
-4%synergy
Spire of Industry
14%inclusion1 decks7 decks
10%synergy
Hydroelectric Specimen
14%inclusion1 decks7 decks
7%synergy
Snow-Covered Island
14%inclusion1 decks7 decks
12%synergy
Ferrous Lake
14%inclusion1 decks7 decks
-10%synergy
Reflecting Pool
14%inclusion1 decks7 decks
9%synergy
Temple of Epiphany
14%inclusion1 decks7 decks
-26%synergy
Cavern of Souls
14%inclusion1 decks7 decks
10%synergy
Path of Ancestry
14%inclusion1 decks7 decks
0%synergy
Sink into Stupor
14%inclusion1 decks7 decks
-3%synergy
Snow-Covered Mountain
14%inclusion1 decks7 decks
12%synergy
Forbidden Orchard
14%inclusion1 decks7 decks
12%synergy
Mana Confluence
14%inclusion1 decks7 decks
7%synergy
Spirebluff Canal
14%inclusion1 decks7 decks
0%synergy
City of Brass
14%inclusion1 decks7 decks
7%synergy
Pinnacle Monk
14%inclusion1 decks7 decks
2%synergy