Dragonshrine of the Ravager

Dragonshrine of the Ravager enters tapped and is indestructible.
{t}, Add {r} or {b} to you mana pool.
As long as you control two Demons or Dragons
or control four lands, lands you control gain
"{t} Add one mana of any color."
{p/r}{p/u}, {t}, Add a +1/+1 counter to a creature you control.