Oblivion Crown is a common Enchantment — Aura card from Future Sight (FUT), collector number 73. Current market price: $0.28 (foil $8.63), TCGplayer market prices via Scryfall.
Flash (You may cast this spell any time you could cast an instant.) Enchant creature Enchanted creature has "Discard a card: This creature gets +1/+1 until end of turn."