Kiona, the Despiser

Bloodthirst X (This creature enters the battlefield with X +1/+1 counters on it, where X is the damage dealt to your opponents this turn.)
{r}{g},{t}: Creatures you control get +X/+X until end of turn, where X equals the number of +1/+1 counters on Kiona, the Despiser.
I want them all dead. Make them dead for me.