Catacomb Deep-Dwell

Catacomb Deep-Dwell is blue.

Morph (You may cast this face down as a 2/2
creature for {3}. Turn it face up any time for its morph
cost. Cards without morph costs can't be turned face
up.)

Submerge {2}{u}{u}{u}

As long as Catacomb Deep-Dwell is face-down,
face-down creatures enter the battlefield face-up.