Karametra's Blessing is a common Instant card from The List (PLST), collector number THB-26. Current market price: $0.12, TCGplayer market prices via Scryfall.
Target creature gets +2/+2 until end of turn. If it's an enchanted creature or enchantment creature, it also gains hexproof and indestructible until end of turn. (It can't be the target of spells or abilities your opponents control. Damage and effects that say "destroy" don't destroy it.)