Kelkios, Miasma Diviner

Whenever you exile a card from the top of your library, choose one:
•Kelkios, Miasma Diviner deals 1 damage to each opponent.
•Each creature other than Kelkios gets -1/-1 until end of turn.
{x}{r}{r}, {t}, Discard a card: Exile the top X cards of your library. Until the end of your next turn, you may play those cards.