Mu'lac, Auspicious Overseer

Eminence —You may look at the top card of
your library. Once per turn, you may cast a spell
from your library at any time. (If you can see it.)
Flash
Shadow, Shroud
When Mu'lac enters or leaves the battlefield, scry
4. Then, if you paid {u}{b}{r} this turn, choose a
card type. Each player puts a spell or permanent
they control of that type into their hand.