hersa, undead-waters chosen

Seclude (during your end step you may choose
to exile this card face down under an island, if its
the only creature under that island than its
"secluded." at your upkeep step you may choose
to put this card back into play, it gains haste).
every third turn that this card is secluded for
bring an artifact card back from your graveyard
and put it into your hand.
if this creature would die instead exile it. if this
card is exiled, move it to exile under an island.
(seclude can activate).