Mountain of Madness

As Mountain of Madness 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 {r} or {c}.
At one of the far ends of the earth they float, marking
the end of what man can comprehend.