Assassin of the deep dark

Terror (This creature deals damage in -1/-1 counters.
Any creature that receives any -1/-1 counters from
this creature also receives a terrified counter).
When this creature enters the battlefield put X
+1/+1 counters on it, and put terrified counters
on up to X target creatures.
{t}: Destroy target creature with a terrified
counter on it.