Mutant Chain Reaction is a common Sorcery card from Teenage Mutant Ninja Turtles (TMT), collector number 125. Current market price: $0.13 (foil $0.23), TCGplayer market prices via Scryfall.
Destroy up to one target artifact, enchantment, or creature with flying. 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.")