Dalthneshtar, God of Madness

Deathtouch, Indestructible, Menace
Whenever a player discards a card, mills, or sacrifices a permanent, put a +1/+1 counter on
target horror or nightmare you control.
When Dalthneshtar first transforms, each player discards their hand and draws cards equal to the
number they just discarded.
When Dalthneshtar deals combat damage to a
player, that player discards a card. If they have
no cards to discard, they lose the game.