Nightingale's Cage

{t} Nightingale’s Cage exiles target nonland permanent with converted mana cost 1 or less.
Return those permanents to the battlefield if Nightingale’s Cage leaves the battlefield
He ordered the best smith to mold / a tiny vessel,
all pure gold. / Inside, the laustic he hid. Then he
sealed up this reliquary / to ever after with him carry.
-Laustic, Marie de France