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.
{p/r}{p/g}{p/w},{t} Rin and Seri, Inseparable deals
damage to any target equal to the number of
Dogs you control. You gain life equal to the
amount ofCats you control.