Shredder's Armor is a uncommon Artifact — Equipment card from Teenage Mutant Ninja Turtles (TMT), collector number 75. Current market price: $0.15 (foil $0.28), TCGplayer market prices via Scryfall.
Equipped creature gets +2/+1. When this Equipment enters, attach it to target creature you control. Equip—Sacrifice another nonland permanent. Activate only once each turn.