Morrie&Dexter,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}: Morrie and Dexter, 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.