Beebo and Gus, 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}: Beebo and Gus deals damage to
any target equal to the number of Dogs you
control. You gain life equal to the number
of Cats you control.