Rin and Seri, Inseparable

Whenever you cast a Dog 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, Inseparable deals damage to any target equal to the number o Dogs you control. You gain life equal to the number of Cats you control.