Lurker Of Depths

Mutate {3}{u}{u}{u} Flash
Cacoon ( You may megamorph this creature on to
another instead of mutating it. Turn it face up at any
time for it's megamorph cost, trigger its mutate ability.)
Megamorph {3}{u}
Whenever this creature Mutates, up to three
target lands an opponent controls, don't untap
on their next untap phase.