Rho'ami, Abzan Druid

Rho'ami, Abzan Druid enters the battlefield with
X +1/+1 counters equal to the mana spent on it.
{b/g}{b/g}, remove a +1/+1 counter: Return target
permanent card from your graveyard to your hand.
{g/w}{g/w}, remove a +1/+1 counter: Put two
+1/+1 counters on another target creature.
{w/b}{w/b}, remove a +1/+1 counter: Put two
1/1 spirit tokens with flying into the battlefield.
You may activate these abilities only when you
could cast a sorcery.