Steel of the Godhead is a common Enchantment — Aura card from Shadowmoor (SHM), collector number 150. Current market price: $3.00 (foil $72.83), TCGplayer market prices via Scryfall.
Enchant creature As long as enchanted creature is white, it gets +1/+1 and has lifelink. (Damage dealt by the creature also causes its controller to gain that much life.) As long as enchanted creature is blue, it gets +1/+1 and can't be blocked.