Falling-Waters Hideaway

Morph — {g/u}{g/w}{w/u}, {t}
Falling-Waters Hideaway enters the battlefield
tapped.
{t}: Add {w}, {u}, or {g}. Use this mana only to pay colored costs or to cast a face-down creature spell.
When Falling-Waters Hideaway is turned face up,
other lands you control gain all activated abilities
of it end of turn.