Unflinching Courage is a uncommon Enchantment — Aura card from Modern Masters 2017 (MM3), collector number 197. Current market price: $0.25 (foil $0.29), TCGplayer market prices via Scryfall.
Enchant creature Enchanted creature gets +2/+2 and has trample and lifelink. (Damage dealt by the creature also causes its controller to gain that much life.)