Rin and Seri, Master

Whenever you cast a Kat spell, create a 1/1 green Cat creature token.
Whenever you cast a Cat spell, create a 1/1 white Dog creature token.
{r}{g}{w}, {t}: Rin and Seri, Master deals damage to any target equal to the number of Kats you control. You gain life equal to the number of Cats you control.