The Book Of Chumbiticus

At the beginning of your end step, if you cast two
or more spells this turn, create a 2/2 green Dog
Spirit creature token.
{t}, Exile The Book Of Chumbiticus and two
Dog creatures. Create Chumbiticus, a legendary
green Dog God creature token with indestructible
Whenever you cast a green spell, gain 2 life and
add two green mana to your mana pool.