Kharnivore, Temo's Masterpiece

Trample, vigilence
Whenever one or more +1/+1 counters are put onto Kharnivore, Temo's Masterpiece, each opponent loses life equal to the number of +1/+1 counters on Kharnivore.
{x}{g}{b}{u}: Put X +1/+1 counters on Kharnivore, where X is the number of +1/+1 counters on Kharnivore.