Activated abilities of artifact tokens you control cost less to activate.
When Mutagen Man enters, create X Mutagen tokens. (They're artifacts with ", , Sacrifice this token: Put a +1/+1 counter on target creature. Activate only as a sorcery.")
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.
Free, repeatable +1/+1 counter generation since artifact-token abilities cost less, making each Mutagen tap for
Generates immediate board presence (artifact tokens) that fuels counters, sacrifice fodder, and artifact-matters payoffs
Recasting Mutagen Man from the command zone refills your token supply, giving inevitability and grind
Mono-green keeps the manabase clean and gives easy access to ramp and counter-doublers
Counters are sorcery-speed and one-shot, so it's slow to assemble a real threat
Board wipes erase your token engine and your counter-loaded creatures at once
Mono-green offers little interaction, removal, or protection for your commander
Relies on having creatures to put counters on—an empty board leaves Mutagens stranded
Legendary Creature — Ooze Mutant
less to activate.
, Sacrifice this token: Put a +1/+1 counter on target creature. Activate only as a sorcery.")
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.