Mutagen Man, Living Ooze

Gameplan

Flood the board with Mutagen artifact tokens (their activation costs thanks to Mutagen Man) and convert them into a pile of +1/+1 counters spread across your creatures, then swing for lethal trample damage or pivot the counters onto a single threat. You ramp early, recast Mutagen Man to refill on tokens, and snowball into an overwhelming green midrange board.

Key Cards

• Hardened Scales — Turns every Mutagen sacrifice into two counters, doubling your engine's output for one mana.
• Branching Evolution — Doubles all +1/+1 counters placed, supercharging each token activation.
• Doubling Season — Doubles both the Mutagen tokens you create on ETB and every counter you place.
• The Ozolith — Banks counters from dying creatures so board wipes don't waste your work.
• Forgotten Ancient — Soaks up counters every turn and moves them around, pairing perfectly with the counter theme.
• Walking Ballista — Counters become removal and a wincon, eating Mutagen counters then firing them at the table.
• Inspiring Statuary — Lets your stockpile of artifact tokens improvise out big spells when you don't need more counters.
• Cathars' Crusade — Each token entering and each counter trigger snowballs your whole team out of control.

Upgrade Path

Lean into counter multipliers (Hardened Scales, Branching Evolution, Kami of Whispered Hopes) and counter payoffs (Walking Ballista, Forgotten Ancient, The Ozolith) so each free Mutagen activation does double or triple duty. Add fast green ramp (Sol Ring, Birds of Paradise, Three Visits) to deploy and recast Mutagen Man repeatedly, and include protection like Heroic Intervention and Tyvar's Stand to defend the board. To raise the ceiling, build a Walking Ballista plus counter-doubler loop or use Inspiring Statuary to power out game-ending green payoffs.