Heroes in a Half Shell is a mythic Legendary Creature — Mutant Ninja Turtle card from Teenage Mutant Ninja Turtles Eternal (TMC), collector number 6. Current market price: $1.47 (foil $0.59), TCGplayer market prices via Scryfall.
Vigilance, menace, trample, haste Whenever one or more Mutants, Ninjas, and/or Turtles you control deal combat damage to a player, put a +1/+1 counter on each of those creatures and draw a card.