Thought-Knot Seer [Oath of the Gatewatch Prerelease Promos] 185 Sacrifice Tempest Efreet: Target opponent

Sacrifice Tempest Efreet: Target opponent may pay 10 life

Sigil of Corruption — When you lose control of Khârn the Betrayer

" —Zimone

Set: The Brothers' War Retro Artifacts Type: Legendary Artifact — Equipment Rarity: Mythic Cost: {4} At the beginning of combat on your turn

Centuries ago

Thought-Knot Seer [Oath of the Gatewatch Prerelease Promos] 185 Sacrifice Tempest Efreet: Target opponentSet: Oath of the Gatewatch Prerelease Promos 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.