Hirovar, City of Lustre

Hirovar, City of Lustre enters the battlefield tapped.
Clerics you control get +1/+1
{t}: Add {w} or {u} to your mana pool
{t}: Add {w}{w}, {u}{u} or {w}{u} to your mana pool. Spend this mana only to cast Cleric spells or activate abilities of Clerics.