Michelangelo, Weirdness to 11 is a mythic Legendary Creature — Mutant Ninja Turtle card from Teenage Mutant Ninja Turtles (TMT), collector number 298. Current market price: — (foil $143.90), TCGplayer market prices via Scryfall.
When Michelangelo enters, create a Mutagen token. (It's an artifact with "{1}, {T}, Sacrifice this token: Put a +1/+1 counter on target creature. Activate only as a sorcery.") If one or more +1/+1 counters would be put on a creature you control, that many plus one +1/+1 counters are put on it instead.