Yhtem, Downfall of Majesty

Flying
You may pay {0} rather than pay the cycling cost
of the first card you cycle each turn.
Whenever you cycle a card, put a -1/-1 counter
on each creature you don't control.
If a creature with a -1/-1 counter on it would die,
exile it. Yhtem deals damage equal to that
creature's converted mana cost to that creature's converted mana cost.