Yonaguni Trench Temple

As Yonaguni Trench Temple enters the
battlefield, you may pay Insanity {3}. If you
don't, it enters the battlefield tapped. (Insanity
is a cost. To pay Insanity 3, shuffle your library,
then exile the top 3 cards.)
{t}: Add {u} or {c}.
It lies ten thousand years from the last time
a devout human of Mu prayed there.