Golbez, Crystal Collector (Commander) - Budget Optimized

Cooper Gottfried
Jan 12, 2026
The Top 40 Two-Mana Commanders
In this latest Top 40 list, Cooper dives into the most popular commanders on EDHREC that you can play for just two mana.
Deck Filters
Cardsphere
Archidekt
Commander Spellbook
Moxfield
Scryfall
MTGStocks
Mana Sculpt
17%inclusion1 decks6 decks
15%synergy
High Synergy Cards
Seat of the Synod
87%inclusion27 decks31 decks
82%synergy
Vault of Whispers
81%inclusion25 decks31 decks
76%synergy
Darksteel Citadel
77%inclusion24 decks31 decks
74%synergy
Etherium Sculptor
74%inclusion23 decks31 decks
70%synergy
Matoya, Archon Elder
71%inclusion22 decks31 decks
66%synergy
Sai, Master Thopterist
61%inclusion19 decks31 decks
58%synergy
Foundry Inspector
61%inclusion19 decks31 decks
58%synergy
Emry, Lurker of the Loch
58%inclusion18 decks31 decks
54%synergy
Thought Monitor
55%inclusion17 decks31 decks
52%synergy
Master of Etherium
48%inclusion15 decks31 decks
46%synergy
Top Cards
Counterspell
55%inclusion17 decks31 decks
-1%synergy
Baleful Strix
52%inclusion16 decks31 decks
28%synergy
Forensic Gadgeteer
48%inclusion15 decks31 decks
46%synergy
Solemn Simulacrum
45%inclusion14 decks31 decks
33%synergy
Myr Battlesphere
45%inclusion14 decks31 decks
44%synergy
Time Sieve
42%inclusion13 decks31 decks
40%synergy
Metalwork Colossus
42%inclusion13 decks31 decks
40%synergy
Swiftfoot Boots
42%inclusion13 decks31 decks
17%synergy
Rook Turret
42%inclusion13 decks31 decks
40%synergy
Ornithopter of Paradise
39%inclusion12 decks31 decks
33%synergy
Game Changers
Bolas's Citadel
29%inclusion9 decks31 decks
23%synergy
Gifts Ungiven
6.5%inclusion2 decks31 decks
5%synergy
Creatures
Padeem, Consul of Innovation
35%inclusion11 decks31 decks
34%synergy
Phyrexian Metamorph
35%inclusion11 decks31 decks
26%synergy
The Reality Chip
35%inclusion11 decks31 decks
32%synergy
Myr Retriever
32%inclusion10 decks31 decks
31%synergy
Kappa Cannoneer
32%inclusion10 decks31 decks
30%synergy
Darksteel Juggernaut
29%inclusion9 decks31 decks
28%synergy
Ornithopter
29%inclusion9 decks31 decks
18%synergy
Filigree Attendant
29%inclusion9 decks31 decks
28%synergy
Riddlesmith
29%inclusion9 decks31 decks
28%synergy
Valkyrie Aerial Unit
29%inclusion9 decks31 decks
28%synergy
Armix, Filigree Thrasher
29%inclusion9 decks31 decks
28%synergy
Imotekh the Stormlord
26%inclusion8 decks31 decks
24%synergy
Noxious Gearhulk
26%inclusion8 decks31 decks
23%synergy
Hullbreaker Horror
26%inclusion8 decks31 decks
10%synergy
Syr Konrad, the Grim
23%inclusion7 decks31 decks
10%synergy
Silver Myr
23%inclusion7 decks31 decks
21%synergy
Ancient Stone Idol
23%inclusion7 decks31 decks
21%synergy
Academy Manufactor
23%inclusion7 decks31 decks
21%synergy
Scrap Trawler
19%inclusion6 decks31 decks
18%synergy
Unshakable Tail
19%inclusion6 decks31 decks
16%synergy
Death's Shadow
19%inclusion6 decks31 decks
19%synergy
Spellskite
19%inclusion6 decks31 decks
12%synergy
Urza, Lord High Artificer
19%inclusion6 decks31 decks
17%synergy
Leaden Myr
19%inclusion6 decks31 decks
18%synergy
Jhoira's Familiar
19%inclusion6 decks31 decks
18%synergy
Y'shtola Rhul
19%inclusion6 decks31 decks
16%synergy
Master Transmuter
19%inclusion6 decks31 decks
19%synergy
The Mechanist, Aerial Artisan
19%inclusion4 decks21 decks
18%synergy
Thopter Assembly
16%inclusion5 decks31 decks
16%synergy
The Cyber-Controller
16%inclusion5 decks31 decks
15%synergy
Junk Diver
16%inclusion5 decks31 decks
16%synergy
Cyberdrive Awakener
16%inclusion5 decks31 decks
14%synergy
Consuming Aberration
16%inclusion5 decks31 decks
1%synergy
Shimmer Myr
16%inclusion5 decks31 decks
15%synergy
Broodstar
13%inclusion4 decks31 decks
12%synergy
Apocalypse Demon
13%inclusion4 decks31 decks
13%synergy
Nick Valentine, Private Eye
13%inclusion4 decks31 decks
13%synergy
Triplicate Titan
13%inclusion4 decks31 decks
12%synergy
Chrome Host Seedshark
13%inclusion4 decks31 decks
12%synergy
Stridehangar Automaton
13%inclusion4 decks31 decks
12%synergy
Traxos, Scourge of Kroog
13%inclusion4 decks31 decks
12%synergy
Shambling Suit
13%inclusion4 decks31 decks
12%synergy
Phyrexian Triniform
13%inclusion4 decks31 decks
12%synergy
Pactdoll Terror
13%inclusion4 decks31 decks
12%synergy
Millikin
13%inclusion4 decks31 decks
10%synergy
Iron Giant
13%inclusion4 decks31 decks
13%synergy
Mm'menon, the Right Hand
12%inclusion3 decks26 decks
11%synergy
Steelswarm Operator
12%inclusion3 decks26 decks
11%synergy
Roadkill Rodney
10%inclusion1 decks10 decks
10%synergy
Fugitive Droid
10%inclusion1 decks10 decks
9%synergy
Instants
Deadly Dispute
39%inclusion12 decks31 decks
31%synergy
Negate
35%inclusion11 decks31 decks
3%synergy
Frantic Search
23%inclusion7 decks31 decks
3%synergy
An Offer You Can't Refuse
23%inclusion7 decks31 decks
-9%synergy
Thirst for Knowledge
23%inclusion7 decks31 decks
21%synergy
Dark Ritual
19%inclusion6 decks31 decks
-17%synergy
Desynchronization
16%inclusion5 decks31 decks
14%synergy
Drown in the Loch
13%inclusion4 decks31 decks
-5%synergy
Cancel
13%inclusion4 decks31 decks
11%synergy
Fact or Fiction
13%inclusion4 decks31 decks
4%synergy
Arcane Denial
13%inclusion4 decks31 decks
-13%synergy
Undermine
13%inclusion4 decks31 decks
11%synergy
Withering Torment
13%inclusion4 decks31 decks
-3%synergy
Scour for Scrap
12%inclusion3 decks26 decks
10%synergy
Ooze Spill
10%inclusion1 decks10 decks
10%synergy
Three Steps Ahead
10%inclusion3 decks31 decks
6%synergy
Countersquall
10%inclusion3 decks31 decks
3%synergy
Reality Shift
10%inclusion3 decks31 decks
-4%synergy
Stern Lesson
10%inclusion3 decks31 decks
9%synergy
Infernal Grasp
10%inclusion3 decks31 decks
-6%synergy
Spell Pierce
10%inclusion3 decks31 decks
4%synergy
Mana Leak
10%inclusion3 decks31 decks
7%synergy
Dramatic Reversal
10%inclusion3 decks31 decks
6%synergy
Swallowed by Leviathan
10%inclusion3 decks31 decks
8%synergy
Swan Song
10%inclusion3 decks31 decks
-9%synergy
Desculpting Blast
7.7%inclusion2 decks26 decks
7%synergy
Consult the Star Charts
7.4%inclusion2 decks27 decks
6%synergy
Wild Unraveling
7.1%inclusion1 decks14 decks
7%synergy
Assert Authority
6.5%inclusion2 decks31 decks
6%synergy
Fell the Profane
6.5%inclusion2 decks31 decks
-9%synergy
Muddle the Mixture
6.5%inclusion2 decks31 decks
2%synergy
Fated Return
6.5%inclusion2 decks31 decks
6%synergy
Whir of Invention
6.5%inclusion2 decks31 decks
5%synergy
Go for the Throat
6.5%inclusion2 decks31 decks
-10%synergy
Brainstorm
6.5%inclusion2 decks31 decks
-23%synergy
Dark Dabbling
6.5%inclusion2 decks31 decks
6%synergy
Essence Scatter
6.5%inclusion2 decks31 decks
5%synergy
Keep Safe
6.5%inclusion2 decks31 decks
6%synergy
Forbidden Alchemy
6.5%inclusion2 decks31 decks
5%synergy
Access Denied
6.5%inclusion2 decks31 decks
6%synergy
Stoic Rebuttal
6.5%inclusion2 decks31 decks
6%synergy
Nexus of Fate
6.5%inclusion2 decks31 decks
5%synergy
Dispel
6.5%inclusion2 decks31 decks
1%synergy
Resculpt
6.5%inclusion2 decks31 decks
0%synergy
Aetherize
6.5%inclusion2 decks31 decks
-5%synergy
Murder
6.5%inclusion2 decks31 decks
-1%synergy
Baleful Mastery
6.5%inclusion2 decks31 decks
3%synergy
Sink into Stupor
6.5%inclusion2 decks31 decks
-9%synergy
Memory Lapse
6.5%inclusion2 decks31 decks
4%synergy
Waterlogged Teachings
6.5%inclusion2 decks31 decks
-5%synergy
Sorceries
Thoughtcast
39%inclusion12 decks31 decks
36%synergy
Feed the Swarm
23%inclusion7 decks31 decks
-12%synergy
Fabricate
19%inclusion6 decks31 decks
16%synergy
Haunt the Network
19%inclusion6 decks31 decks
18%synergy
Buried Alive
19%inclusion6 decks31 decks
11%synergy
Singularity Rupture
19%inclusion5 decks27 decks
6%synergy
Terisiare's Devastation
13%inclusion4 decks31 decks
12%synergy
Diabolic Tutor
13%inclusion4 decks31 decks
6%synergy
Their Name Is Death
13%inclusion4 decks31 decks
12%synergy
Toxic Deluge
13%inclusion4 decks31 decks
-13%synergy
Game Over
10%inclusion1 decks10 decks
10%synergy
Windfall
10%inclusion3 decks31 decks
-4%synergy
Lively Dirge
10%inclusion3 decks31 decks
8%synergy
Victimize
10%inclusion3 decks31 decks
-4%synergy
Dread Return
10%inclusion3 decks31 decks
3%synergy
Blood Money
10%inclusion3 decks31 decks
8%synergy
Reanimate
10%inclusion3 decks31 decks
-15%synergy
Splinter's Technique
7.7%inclusion1 decks13 decks
6%synergy
Monumental Corruption
6.5%inclusion2 decks31 decks
6%synergy
Unmarked Grave
6.5%inclusion2 decks31 decks
4%synergy
Stock Up
6.5%inclusion2 decks31 decks
5%synergy
Reshape
6.5%inclusion2 decks31 decks
6%synergy
Treasure Cruise
6.5%inclusion2 decks31 decks
-2%synergy
Deep Analysis
6.5%inclusion2 decks31 decks
3%synergy
Lich-Knights' Conquest
6.5%inclusion2 decks31 decks
5%synergy
Pilfered Plans
6.5%inclusion2 decks31 decks
4%synergy
Time Warp
6.5%inclusion2 decks31 decks
5%synergy
March of Progress
6.5%inclusion2 decks31 decks
6%synergy
Tendrils of Agony
6.5%inclusion2 decks31 decks
6%synergy
Powerstone Fracture
6.5%inclusion2 decks31 decks
6%synergy
Night's Whisper
6.5%inclusion2 decks31 decks
0%synergy
Relm's Sketching
6.5%inclusion2 decks31 decks
5%synergy
Utility Artifacts
Collector's Vault
39%inclusion12 decks31 decks
37%synergy
Planetarium of Wan Shi Tong
29%inclusion6 decks21 decks
26%synergy
Cloud Key
26%inclusion8 decks31 decks
24%synergy
Mystic Forge
26%inclusion8 decks31 decks
24%synergy
Encroaching Mycosynth
23%inclusion7 decks31 decks
22%synergy
Krark-Clan Ironworks
23%inclusion7 decks31 decks
22%synergy
Sculpting Steel
19%inclusion6 decks31 decks
18%synergy
Lightning Greaves
19%inclusion6 decks31 decks
-8%synergy
Uthros Research Craft
19%inclusion5 decks27 decks
17%synergy
Ashnod's Altar
16%inclusion5 decks31 decks
9%synergy
Trading Post
16%inclusion5 decks31 decks
16%synergy
Worldwalker Helm
16%inclusion5 decks31 decks
15%synergy
Sensei's Divining Top
13%inclusion4 decks31 decks
4%synergy
Tormod's Crypt
13%inclusion4 decks31 decks
11%synergy
The Everflowing Well
13%inclusion4 decks31 decks
11%synergy
Repurposing Bay
13%inclusion4 decks31 decks
12%synergy
The Underworld Cookbook
13%inclusion4 decks31 decks
12%synergy
Aether Spellbomb
13%inclusion4 decks31 decks
12%synergy
Ichor Wellspring
13%inclusion4 decks31 decks
12%synergy
Demonic Junker
13%inclusion4 decks31 decks
12%synergy
Winter Moon
13%inclusion4 decks31 decks
13%synergy
Cranial Plating
13%inclusion4 decks31 decks
11%synergy
Cryogen Relic
12%inclusion3 decks26 decks
10%synergy
Synthesizer Labship
12%inclusion3 decks26 decks
11%synergy
Arcade Cabinet
10%inclusion1 decks10 decks
10%synergy
Coin of Mastery
10%inclusion1 decks10 decks
10%synergy
Grinding Station
10%inclusion3 decks31 decks
9%synergy
Unwinding Clock
10%inclusion3 decks31 decks
9%synergy
Wayfarer's Bauble
10%inclusion3 decks31 decks
-3%synergy
Grim Bauble
10%inclusion3 decks31 decks
9%synergy
Mishra's Bauble
10%inclusion3 decks31 decks
8%synergy
Mindcrank
10%inclusion3 decks31 decks
-2%synergy
Nihil Spellbomb
10%inclusion3 decks31 decks
9%synergy
Stone of Erech
10%inclusion3 decks31 decks
8%synergy
Lux Cannon
10%inclusion3 decks31 decks
9%synergy
Isochron Scepter
10%inclusion3 decks31 decks
7%synergy
The Lunar Whale
10%inclusion3 decks31 decks
9%synergy
Executioner's Capsule
10%inclusion3 decks31 decks
9%synergy
Strionic Resonator
10%inclusion3 decks31 decks
6%synergy
Matzalantli, the Great Door
6.5%inclusion2 decks31 decks
4%synergy
Urza's Bauble
6.5%inclusion2 decks31 decks
6%synergy
Defense Grid
6.5%inclusion2 decks31 decks
6%synergy
The Temporal Anchor
6.5%inclusion2 decks31 decks
6%synergy
Jalum Tome
6.5%inclusion2 decks31 decks
6%synergy
Soul-Guide Lantern
6.5%inclusion2 decks31 decks
4%synergy
Moonsilver Key
6.5%inclusion2 decks31 decks
6%synergy
Conjurer's Bauble
6.5%inclusion2 decks31 decks
6%synergy
Aetherflux Reservoir
6.5%inclusion2 decks31 decks
5%synergy
Vedalken Orrery
6.5%inclusion2 decks31 decks
6%synergy
Golem's Heart
6.5%inclusion2 decks31 decks
6%synergy
Enchantments
Mirrodin Besieged
39%inclusion12 decks31 decks
37%synergy
Enhanced Surveillance
35%inclusion11 decks31 decks
32%synergy
Efficient Construction
32%inclusion10 decks31 decks
31%synergy
Thopter Spy Network
29%inclusion9 decks31 decks
27%synergy
Mechanized Production
26%inclusion8 decks31 decks
24%synergy
Biotransference
16%inclusion5 decks31 decks
15%synergy
Unstoppable Plan
13%inclusion4 decks31 decks
11%synergy
Propaganda
13%inclusion4 decks31 decks
-5%synergy
Retro-Mutation
10%inclusion1 decks10 decks
10%synergy
Phyrexian Scriptures
10%inclusion3 decks31 decks
9%synergy
Artificer Class
10%inclusion3 decks31 decks
9%synergy
Mornsong Aria
7.1%inclusion1 decks14 decks
7%synergy
Case of the Shifting Visage
6.5%inclusion2 decks31 decks
4%synergy
Mind Control
6.5%inclusion2 decks31 decks
6%synergy
Imprisoned in the Moon
6.5%inclusion2 decks31 decks
3%synergy
Stasis Field
6.5%inclusion2 decks31 decks
6%synergy
Painful Quandary
6.5%inclusion2 decks31 decks
5%synergy
Animate Dead
6.5%inclusion2 decks31 decks
-4%synergy
Nowhere to Run
6.5%inclusion2 decks31 decks
5%synergy
Mirror Room // Fractured Realm
6.5%inclusion2 decks31 decks
5%synergy
Phyrexian Arena
6.5%inclusion2 decks31 decks
-7%synergy
Dictate of Kruphix
6.5%inclusion2 decks31 decks
6%synergy
Planeswalkers
Tezzeret, Artifice Master
10%inclusion3 decks31 decks
9%synergy
Tezzeret, Master of the Bridge
10%inclusion3 decks31 decks
8%synergy
Tezzeret, Betrayer of Flesh
6.5%inclusion2 decks31 decks
6%synergy
Utility Lands
Archway of Innovation
32%inclusion10 decks31 decks
30%synergy
Treasure Vault
29%inclusion9 decks31 decks
27%synergy
Bojuka Bog
23%inclusion7 decks31 decks
-16%synergy
Reliquary Tower
23%inclusion7 decks31 decks
-13%synergy
Midgar, City of Mako
23%inclusion7 decks31 decks
20%synergy
Buried Ruin
16%inclusion5 decks31 decks
13%synergy
Rogue's Passage
16%inclusion5 decks31 decks
-11%synergy
Cephalid Coliseum
13%inclusion4 decks31 decks
7%synergy
Academy Ruins
13%inclusion4 decks31 decks
9%synergy
Uthros, Titanic Godcore
11%inclusion3 decks27 decks
9%synergy
The Gold Saucer
10%inclusion3 decks31 decks
9%synergy
Susur Secundi, Void Altar
7.4%inclusion2 decks27 decks
6%synergy
Rivendell
6.5%inclusion2 decks31 decks
1%synergy
Urza's Tower
6.5%inclusion2 decks31 decks
6%synergy
Mistrise Village
6.5%inclusion2 decks31 decks
3%synergy
Urza's Mine
6.5%inclusion2 decks31 decks
6%synergy
Inventors' Fair
6.5%inclusion2 decks31 decks
4%synergy
Thespian's Stage
6.5%inclusion2 decks31 decks
5%synergy
Temple of the False God
6.5%inclusion2 decks31 decks
-3%synergy
Jidoor, Aristocratic Capital
6.5%inclusion2 decks31 decks
2%synergy
Urza's Power Plant
6.5%inclusion2 decks31 decks
6%synergy
Mana Artifacts
Sol Ring
97%inclusion30 decks31 decks
9%synergy
Arcane Signet
90%inclusion28 decks31 decks
7%synergy
Dimir Signet
61%inclusion19 decks31 decks
2%synergy
Thought Vessel
58%inclusion18 decks31 decks
27%synergy
Mind Stone
58%inclusion18 decks31 decks
30%synergy
Talisman of Dominance
52%inclusion16 decks31 decks
-6%synergy
Commander's Sphere
39%inclusion12 decks31 decks
22%synergy
Hedron Archive
39%inclusion12 decks31 decks
37%synergy
Everflowing Chalice
32%inclusion10 decks31 decks
27%synergy
Fellwar Stone
26%inclusion8 decks31 decks
-5%synergy
Crystal Skull, Isu Spyglass
26%inclusion8 decks31 decks
24%synergy
Thran Dynamo
19%inclusion6 decks31 decks
14%synergy
Basalt Monolith
16%inclusion5 decks31 decks
15%synergy
Liquimetal Torque
16%inclusion5 decks31 decks
14%synergy
Bender's Waterskin
15%inclusion4 decks26 decks
10%synergy
Charcoal Diamond
13%inclusion4 decks31 decks
5%synergy
Sky Diamond
13%inclusion4 decks31 decks
5%synergy
Decanter of Endless Water
13%inclusion4 decks31 decks
8%synergy
Chromatic Lantern
13%inclusion4 decks31 decks
11%synergy
Midnight Clock
13%inclusion4 decks31 decks
6%synergy
Springleaf Drum
10%inclusion3 decks31 decks
8%synergy
Skyclave Relic
10%inclusion3 decks31 decks
9%synergy
Gilded Lotus
10%inclusion3 decks31 decks
7%synergy
Blitzball
10%inclusion3 decks31 decks
9%synergy
Dreamstone Hedron
6.5%inclusion2 decks31 decks
6%synergy
Chromatic Sphere
6.5%inclusion2 decks31 decks
6%synergy
Vexing Puzzlebox
6.5%inclusion2 decks31 decks
6%synergy
Coveted Jewel
6.5%inclusion2 decks31 decks
6%synergy
Stonespeaker Crystal
6.5%inclusion2 decks31 decks
6%synergy
Prismatic Lens
6.5%inclusion2 decks31 decks
5%synergy
Moonsnare Prototype
6.5%inclusion2 decks31 decks
6%synergy
Chromatic Star
6.5%inclusion2 decks31 decks
6%synergy
Lands
Swamp
100%inclusion31 decks31 decks
3%synergy
Island
100%inclusion31 decks31 decks
3%synergy
Command Tower
71%inclusion22 decks31 decks
-17%synergy
Mistvault Bridge
71%inclusion22 decks31 decks
66%synergy
Sunken Hollow
61%inclusion19 decks31 decks
-4%synergy
Darkwater Catacombs
39%inclusion12 decks31 decks
-1%synergy
Choked Estuary
39%inclusion12 decks31 decks
-9%synergy
Tainted Isle
35%inclusion11 decks31 decks
-9%synergy
Temple of Deceit
35%inclusion11 decks31 decks
0%synergy
Drowned Catacomb
35%inclusion11 decks31 decks
-19%synergy
Dimir Aqueduct
32%inclusion10 decks31 decks
-6%synergy
Exotic Orchard
29%inclusion9 decks31 decks
-3%synergy
Spire of Industry
23%inclusion7 decks31 decks
21%synergy
Underground River
23%inclusion7 decks31 decks
-18%synergy
Dismal Backwater
23%inclusion7 decks31 decks
7%synergy
Myriad Landscape
19%inclusion6 decks31 decks
-1%synergy
Fetid Pools
19%inclusion6 decks31 decks
3%synergy
Treno, Dark City
16%inclusion5 decks31 decks
14%synergy
Watery Grave
13%inclusion4 decks31 decks
-35%synergy
Sinister Hideout
12%inclusion3 decks26 decks
9%synergy
Dimir Guildgate
10%inclusion3 decks31 decks
3%synergy
Power Depot
10%inclusion3 decks31 decks
9%synergy
River of Tears
10%inclusion3 decks31 decks
0%synergy
Evolving Wilds
10%inclusion3 decks31 decks
-7%synergy
Contaminated Aquifer
10%inclusion3 decks31 decks
4%synergy
Scene of the Crime
10%inclusion3 decks31 decks
9%synergy
Darkslick Shores
10%inclusion3 decks31 decks
-4%synergy
Crystal Grotto
10%inclusion3 decks31 decks
9%synergy
Fell the Profane
6.5%inclusion2 decks31 decks
-9%synergy
Terramorphic Expanse
6.5%inclusion2 decks31 decks
-5%synergy
Clearwater Pathway
6.5%inclusion2 decks31 decks
-18%synergy
Ice Tunnel
6.5%inclusion2 decks31 decks
2%synergy
Shipwreck Marsh
6.5%inclusion2 decks31 decks
-34%synergy
Thriving Isle
6.5%inclusion2 decks31 decks
4%synergy
Ash Barrens
6.5%inclusion2 decks31 decks
1%synergy
Sink into Stupor
6.5%inclusion2 decks31 decks
-9%synergy
Secret Passage
6.5%inclusion2 decks31 decks
6%synergy
Soured Springs
6.5%inclusion2 decks31 decks
3%synergy
Waterlogged Teachings
6.5%inclusion2 decks31 decks
-5%synergy
Sunken Ruins
6.5%inclusion2 decks31 decks
-10%synergy
Port of Karfell
6.5%inclusion2 decks31 decks
0%synergy