Death's Breath

Put 3 time counters on target creature, at the beginning of each end step, remove a time counter, when that creature has no time counters destroy it.
"Death, an inevitability, everyone gets there someday, even if you've survived this, know just this, death will come for you, if not today, someday
you will perish, but, in the end, so will I."
-- Rena, Devourer of Empires