Warbriar Blessing is a common Enchantment — Aura card from Theros Beyond Death (THB), collector number 204. Current market price: $0.17 (foil $0.30), TCGplayer market prices via Scryfall.
Enchant creature you control When this Aura enters, enchanted creature fights up to one target creature you don't control. (Each deals damage equal to its power to the other.) Enchanted creature gets +0/+2.