Remy and Stan, 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}: Remy and Stan, 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.
They may seem like enemies, but in secret they work
together like best friends.