Baxter, Fly in the Ointment is a rare Legendary Creature — Insect Mutant Scientist card from Teenage Mutant Ninja Turtles Eternal (TMC), collector number 10. Current market price: $0.24, TCGplayer market prices via Scryfall.
Whenever Baxter enters or attacks, each creature you control with a counter on it gains flying until end of turn. Whenever you draw a card, put a +1/+1 counter on Baxter.