Pop-up Zombie

{b}— Jumpscare 1, Whenever a creature dies.
(Exile this card face down from your hand for its jumpscare cost and put 1 horror counter(s) on it.
At the beginning of each end step remove x
horror counters from this card where x is the
number of times jumpscare was triggered this
turn. You may cast this card without paying its
mana cost as long as it remains exiled if there are
no horror counters on it.)
"Braaaains."