Thrax, The Tormented

Thrax, The Tormented enters the battlefield with X Blood Counters.
Whenever Thrax, The Tormented takes damage, put that that many Blood Counters on Thrax, the Tormented.
At the beginning of each end step if Thrax, the Tormented has no Blood Counters, Sacrifice it.
Remove 1 Blood Counter, Choose one: Target creature gets -2/-0 until end of turn, Thrax gains +2/+0 until end of turn.