Shoreline Elemental - Mairsil

[[Shorecrasher elemental]] can blink itself but it comes back face down.

if i exile shoreline with [[mairsil, the pretender]] , then blink mairsil what will happen?

does it come back face down/not atall/something else?

does its’ etb trigger so i can exile a new card?

does it have megamorph?

does it have abilities exiled with it whilst face down?