Thought-Knot Seer is a rare Creature — Eldrazi card from The List (PLST), collector number OGW-9. Current market price: $6.72, 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.