At a glance
- Format: Brawl (100-card)
- Commander: Fynn, the Fangbearer
- Colors: Green (G)
- Archetype: Mono-G toxic/poison alt-win (budget)
- Power tier: competitive
- Competitive Brawl: ✅ Legal
Strategy
Fynn turns every deathtouch combat hit into two poison counters, so this build floods the board with the cheapest deathtouch bodies Arena can craft (Moss Viper, Tajuru Blightblade, Mirkwood Spider, Underdark Basilisk) plus toxic beaters (Branchblight Stalker, Venomous Brutalizer, Tyrranax Atrocity, Paladin of Predation) that stack counters on their own. A common/uncommon proliferate suite (Evolution Sage, Contagious Vorrac, Pollenbright Druid, Courage in Crisis, Urban Daggertooth) multiplies whatever poison sticks while a full green mana-dork package keeps the gas flowing. Deathtouch granters (Gorgon Flail, Blooming Stinger, Mirkwood Spider) and fight removal (Rabid Bite, Ram Through, Infectious Bite) convert non-deathtouch attackers into Fynn triggers and kill anything once deathtouch is attached. The kill is a proliferated poison clock closed by Noxious Assault or Overrun for an alpha strike, protected through wraths by Snakeskin Veil, Blossoming Defense, and Inspiring Call.
Upgrade path
This is the playable-now budget build: every card is owned or a cheap common/uncommon craft, and the commander Fynn is uncommon (owned check: owned_qty 0, so craft the uncommon, zero rare/mythic wildcards spent). The ideal power version at data/decks_json/brawl-toxic.json is the upgrade target — craft in the rare/mythic payoffs over time: Triumph of the Hordes and Craterhoof Behemoth as one-swing finishers, Contagion Engine and Staff of Compleation for double-proliferate, God-Eternal Rhonas / Rhonas / Questing Beast / Tyrranax Rex as bombs, Basilisk Collar and Saryth for deathtouch-granting, and The Great Henge / Return of the Wildspeaker for card advantage. Budget subs standing in for those: Gorgon Flail (Basilisk Collar), Overrun + Noxious Assault (Triumph/Craterhoof), Inspiring Call + Blossoming Defense (Heroic Intervention/Saryth protection), Paladin of Predation + Viral Spawning (Tyrranax Rex / toxic payoffs).
Cards
Decklist
Paste straight into MTG Arena (or Moxfield/Archidekt):
Commander
1 Fynn, the Fangbearer
Deck
1 Llanowar Elves
1 Druid of the Cowl
1 Ilysian Caryatid
1 Great Forest Druid
1 Elvish Archdruid
1 Arcane Signet
1 Mind Stone
1 Pristine Talisman
1 Solemn Simulacrum
1 Wayfarer's Bauble
1 Noxious Newt
1 Frog Butler
1 Sedge Scorpion
1 Fang of Shigeki
1 Gnarlwood Dryad
1 Narnam Renegade
1 Thornweald Archer
1 Flesh Burrower
1 Toxic Scorpion
1 Venom Connoisseur
1 Serpent Specialist
1 Walltop Sentries
1 Ichorspit Basilisk
1 Branchblight Stalker
1 Venomous Brutalizer
1 Tyrranax Atrocity
1 Plague Nurse
1 Virulent Emissary
1 Evolution Sage
1 Adaptive Sporesinger
1 Pollenbright Druid
1 Bloom Hulk
1 Contagious Vorrac
1 Garruk's Uprising
1 Colossal Majesty
1 Elemental Bond
1 Poison the Blade
1 Infectious Bite
1 Rabid Bite
1 Run Over
1 Ram Through
1 Beast Within
1 Pawpatch Formation
1 Cankerbloom
1 Snakeskin Veil
1 Moss Viper
1 Tajuru Blightblade
1 Mirkwood Spider
1 Underdark Basilisk
1 Blooming Stinger
1 Jewel-Eyed Cobra
1 Deathbloom Gardener
1 Gorgon Flail
1 Prosthetic Injector
1 Courage in Crisis
1 Urban Daggertooth
1 Paladin of Predation
1 Viral Spawning
1 Overrun
1 Noxious Assault
1 Inspiring Call
1 Blossoming Defense
1 Command Tower
1 Karn's Bastion
1 Nesting Grounds
34 Forest
Ideal build (upgrade target)
The power-ceiling build (multi-agent workflow output) — every premium payoff and the full combo/synergy package. The current list is the playable-now budget version; craft toward this as your wildcards come in.
Crafts to reach the ideal: 18 (10 mythic, 6 rare, 1 uncommon, 1 other)
- Mythic: Bristly Bill, Spine Sower, Contagion Engine, Craterhoof Behemoth, God-Eternal Rhonas, Questing Beast, Rhonas the Indomitable, Staff of Compleation, The Great Henge, Triumph of the Hordes, Tyrranax Rex
- Rare: Basilisk Collar, Bloated Contaminator, Heroic Intervention, Return of the Wildspeaker, Saryth, the Viper’s Fang, Venerated Rotpriest
- Uncommon: Rogue’s Passage
- Other: Ambush Viper
Full ideal list (paste into Arena):
Commander
1 Fynn, the Fangbearer
Deck
1 Llanowar Elves
1 Druid of the Cowl
1 Ilysian Caryatid
1 Great Forest Druid
1 Elvish Archdruid
1 Arcane Signet
1 Mind Stone
1 Pristine Talisman
1 Solemn Simulacrum
1 Wayfarer's Bauble
1 Noxious Newt
1 Frog Butler
1 Sedge Scorpion
1 Fang of Shigeki
1 Gnarlwood Dryad
1 Narnam Renegade
1 Thornweald Archer
1 Flesh Burrower
1 Toxic Scorpion
1 Venom Connoisseur
1 Ambush Viper
1 Serpent Specialist
1 Walltop Sentries
1 Ichorspit Basilisk
1 Branchblight Stalker
1 Venomous Brutalizer
1 Tyrranax Atrocity
1 Plague Nurse
1 Bloated Contaminator
1 Tyrranax Rex
1 Virulent Emissary
1 Evolution Sage
1 Adaptive Sporesinger
1 Pollenbright Druid
1 Bloom Hulk
1 Contagious Vorrac
1 Contagion Engine
1 Staff of Compleation
1 Venerated Rotpriest
1 Saryth, the Viper's Fang
1 Rhonas the Indomitable
1 Questing Beast
1 God-Eternal Rhonas
1 Bristly Bill, Spine Sower
1 Triumph of the Hordes
1 Craterhoof Behemoth
1 Basilisk Collar
1 Poison the Blade
1 Garruk's Uprising
1 Colossal Majesty
1 Elemental Bond
1 Return of the Wildspeaker
1 The Great Henge
1 Infectious Bite
1 Rabid Bite
1 Run Over
1 Ram Through
1 Beast Within
1 Pawpatch Formation
1 Cankerbloom
1 Snakeskin Veil
1 Heroic Intervention
1 Command Tower
1 Karn's Bastion
1 Nesting Grounds
1 Rogue's Passage
33 Forest
Card images & data via Scryfall.