Hydrothaumic Cave

Hydrothaumic Cave comes into play tapped.
It does not untap during the first untap phase
after it enters play.
{t}: Add {c}{u} or {c}{b}.
"Many of these opening were bored in ancient days,
by some strange Titan. Who put medaliths there
that still pull mixed essence into them. Perhaps
harnessing enough for it to go home."