Answered Prayers is a common Enchantment card from Modern Horizons (MH1), collector number 2. Current market price: $0.17 (foil $1.08), TCGplayer market prices via Scryfall.
Whenever a creature you control enters, you gain 1 life. If this enchantment isn't a creature, it becomes a 3/3 Angel creature with flying in addition to its other types until end of turn.