Undiscovered Druid

{t}: Add {g}.
{t}: Add {g}{u}. Spend this mana to only cast
a multicolored spells.
{t}: Add {g}{u}{r}. Activate this ability only
if Undiscovered Druid has a +1/+1 counter.
Whenever you cascade, put a +1/+1 counter
on Undiscovered Druid.