Mutagen Man, Living Ooze is a rare Legendary Creature — Ooze Mutant card from Teenage Mutant Ninja Turtles (TMT), collector number 124. Current market price: $1.73 (foil $2.62), TCGplayer market prices via Scryfall.
Trample Activated abilities of artifact tokens you control cost {1} less to activate. When Mutagen Man enters, create X Mutagen tokens. (They're artifacts with "{1}, {T}, Sacrifice this token: Put a +1/+1 counter on target creature. Activate only as a sorcery.")