IXA, Intercept X Attacker

First strike, Protection from Bats and Vampires, Vigilance
Whenever IXA enters the battlefield or attacks,
place a +1/+1 counter on it.
At beginning of your end step, if IXA has 4 or
more +1/+1 counters on it, sacrifice it.
{r}{x}{x},{t}: Remove X +1/+1 counters from IXA.
Place it on target creature you control.