Retro-Mutation is a common Enchantment — Aura card from Teenage Mutant Ninja Turtles (TMT), collector number 51. Current market price: $0.20 (foil $0.23), TCGplayer market prices via Scryfall.
Flash Enchant creature Enchanted creature is a Turtle with base power and toughness 0/1. It can't attack and loses all abilities. (It also loses all other creature types.)