CatDog, Inseperable

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}: CatDog, 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.