Gruul, Grassfoot Brawler

Whenever Gruul, Grassfoot Brawler deals damage
to a creature, you gain an experience counter.
Gruul, Grassfoot Brawler gets +1/+1 for each experience counter you have.
{r},{t}: Gruul fights target creature you don't
control.
{2}{g}{g},{t}: Transform Gruul, Grassfoot Brawler