Assault Suit is a uncommon Artifact — Equipment card from Commander Masters (CMM), collector number 369. Current market price: $0.35 (foil $0.39), TCGplayer market prices via Scryfall.
Equipped creature gets +2/+2, has haste, can't attack you or planeswalkers you control, and can't be sacrificed. At the beginning of each opponent's upkeep, you may have that player gain control of equipped creature until end of turn. If you do, untap it. Equip {3}