Thought-Knot Seer [The List] Explorers of Ixalan Set: Ixalan Promos Type: Land

Set: Ixalan Promos Type: Land Rare Cost: Dragonskull Summit enters the battlefield tapped unless you control a Swamp or a Mountain

Set: Amonkhet Promos Type: Legendary Creature — God Mythic Cost: {2}{B} Menace

Its owner cracks it open to see what jewels it holds

or Genesis AC adapters

Set: Guilds of Ravnica Type: Creature — Elf Druid Rare Cost: {2}{G}{G} Whenever you cast a creature spell

Thought-Knot Seer [The List] Explorers of Ixalan Set: Ixalan Promos Type: LandSet: The List Type: Creature Eldrazi Rarity: Rare Cost: {3}{C} ({C} represents colorless mana.) When Thought Knot Seer enters the battlefield, target opponent reveals their hand. You choose a nonland card from it and exile that card. When Thought Knot Seer leaves the battlefield, target opponent draws a card.