Leonardo, the Balance is a mythic Legendary Creature — Mutant Ninja Turtle card from Teenage Mutant Ninja Turtles Eternal (TMC), collector number 1. Current market price: $1.60 (foil $0.58), TCGplayer market prices via Scryfall.
Whenever a token you control enters, you may put a +1/+1 counter on each creature you control. Do this only once each turn. {W}{U}{B}{R}{G}: Creatures you control gain menace, trample, and lifelink until end of turn. Partner—Character select (You can have two commanders if both have this ability.)