Minero, City of Twilight

Minero, City of Twilight enters the battlefield tapped.
Vampires you control get +1/+1
{t}: Add {r} or {b} to your mana pool.
{t}: Add {r}{r}, {b}{b} or {r}{b} to your mana pool. Spend this mana only to cast Vampire spells or activate abilities of Vampires.