Nightmares and Daydreams is a rare Enchantment — Saga card from Avatar: The Last Airbender Eternal (TLE), collector number 94. Current market price: $0.20 (foil $1.16), TCGplayer market prices via Scryfall.
(As this Saga enters and after your draw step, add a lore counter. Sacrifice after IV.) I, II, III — Until your next turn, whenever you cast an instant or sorcery spell, target player mills cards equal to that spell's mana value. IV — Draw a card. If a graveyard has twenty or more cards in it, draw three cards instead.