Sanguimordial Cleft

As Sanguimordial Cleft 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 {b} or {c}.
No man knows of the loney pools of rotting blood
that predate all earthly flesh by eons.