Mira and Rita, 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}}: Mira and Rita, 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.