Atemsis, All-Seeing (M20) from Core Set 2020, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Ryan Pancoast
• Card Text:
  Flying
  2U, T: Draw two cards, then discard a card.
  Whenever Atemsis, All-Seeing deals damage to an opponent, you may reveal your hand. If cards with at least six different converted mana costs are revealed this way, that player loses the game.