Nylia, City of Fading Elation

Nylia, City of Fading Elation enters the battlefield tapped.
Druids you control get +1/+1
{t}: Add {r} or {g} to your mana pool.
{t}: Add {g}{g}, {r}{r}, or {r}{g} to your mana pool. Spend this mana only to cast Druid spells or activate abilities of Druids.