Shub-Niggurath

Devoid, Indestructible, Menace
When Shub-Niggurath enters the
battlefield or attacks, each opponent
sacrifices a creature with the highest
power among creatures they control.
Each opponent who cannot loses 3 life
and exiles the top card of their library. Choose
a card exiled this way and you may play it this
turn without paying its mana cost.