Fallen Ideal is a uncommon Enchantment — Aura card from The List (PLST), collector number C15-125. Current market price: $0.43, TCGplayer market prices via Scryfall.
Enchant creature Enchanted creature has flying and "Sacrifice a creature: This creature gets +2/+1 until end of turn." When this Aura is put into a graveyard from the battlefield, return it to its owner's hand.