Yog-Sothoth, Key and Gate

Devoid
Cast Yog-Sothoth only if you have more than ten
cards in hand
{3}{w}{u}{b}{r}{g}: you may exile the top card of each player's library, you may cast those cards until
end of turn.
Yog-Sothoth knows the gate. Yog-Sothoth is the gate.
Yog-Sothoth is the key and guardian of the gate.