Intet, the Dreamer is a rare Legendary Creature — Dragon card from Planar Chaos (PLC), collector number 158. Current market price: $0.68 (foil $15.79), TCGplayer market prices via Scryfall.
Flying Whenever Intet deals combat damage to a player, you may pay {2}{U}. If you do, exile the top card of your library face down. You may look at that card for as long as it remains exiled. You may play that card without paying its mana cost for as long as Intet remains on the battlefield.