Thought-Knot Seer is a mythic Creature — Eldrazi card from Special Guests (SPG), collector number 39. Current market price: $6.57 (foil $11.25), TCGplayer market prices via Scryfall.
({C} represents colorless mana.) When this creature enters, target opponent reveals their hand. You choose a nonland card from it and exile that card. When this creature leaves the battlefield, target opponent draws a card.