Steel Seraph is a rare Artifact Creature — Angel card from The Brothers' War Promos (PBRO), collector number 38s. Current market price: — (foil $3.18), TCGplayer market prices via Scryfall.
Prototype {1}{W}{W} — 3/3 (You may cast this spell with different mana cost, color, and size. It keeps its abilities and types.) Flying At the beginning of combat on your turn, target creature you control gains your choice of flying, vigilance, or lifelink until end of turn.