Atemsis, All-Seeing (PM20 46p)

Legendary Creature — Sphinx • Mana cost: {3}{U}{U}{U} • Core Set 2020 Promos • Rare

Flying
{2}{U}, {T}: Draw two cards, then discard a card.
Whenever Atemsis deals damage to an opponent, you may reveal your hand. If cards with at least six different mana values are revealed this way, that player loses the game.

Illustrated by Ryan Pancoast.