Ronin, Shadow Stalker is a uncommon Legendary Creature — Human Rogue Hero card from Marvel Super Heroes (MSH), collector number 112. Current market price: $0.12 (foil $0.24), TCGplayer market prices via Scryfall.
Pay 2 life: Add two mana of any one color. Spend this mana only to cast Equipment spells or activate equip abilities. Activate only once each turn. {T}, Sacrifice an Equipment attached to Ronin: Target creature gets -4/-4 until end of turn. Activate only as a sorcery.