Mona Lisa, Ever Adaptable

Set: Commander: Teenage Mutant Ninja Turtles (#126)

Rarity: Rare

Type: Legendary Creature — Lizard Mutant

Mana Cost: {3}{G}

Colors: Green

P/T: 4/4

Whenever a player casts a creature spell, you 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.")