Kahntiir victus, ruin creator

Flying, first strike, menace, deathtouch
When Kahntiir Victas, ruin creator enters the battlefield exile target creature.
When this creature attacks destroy target creature.
{b}{b}{b}: destroy target creature.
{r}{r}{r}: each opponents loses 4 life.
{g}{g}{g}: put two +1+1 counters on target creature, proliferate then proliferate again.