The Scarlet Witch

Shroud
Whenever Scarlet Witch enters or leaves the battlefield, each player discards a card at random and Scarlet Witch deals 2 damage to any target.
{3}{b}{r}: Exile Scarlet Witch. Each player loses half their life, sacrifices half the creatures they control, and discards half the cards in their hand, rounding up each time. Return Scarlet Witch to the battlefield under your control at the beginning of your next upkeep.