Iroas's Blessing is a common Enchantment — Aura card from Theros Beyond Death (THB), collector number 142. Current market price: $0.07 (foil $0.16), TCGplayer market prices via Scryfall.
Enchant creature you control When this Aura enters, it deals 4 damage to target creature or planeswalker an opponent controls. Enchanted creature gets +1/+1.