Gus and June, The Goonies

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 of Dogs
you control. You gain life equal to the number
of Cats you control.