{Containment Priest}
Will it exile manifest creatures and creatures with Morph?
Cards manifested from the top of your library would be sacrificed as they were not cast from your hand. Creatures that are cast as a 2/2 morph from your hand will not be exiled as they were cast from your hand. Anything that is legally face down on the board will not get exiled when turned face up as nothing new is entering the battlefield.