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Describe the Bug:
You can use the activated ability of Lantern Spirit many times (correct)in stack but it will return to hand an equal number of Lantern Spirit s.

Which card did behave improperly ?
Lantern Spirit

Which update are you using?(date,name)Which type(Duel,Gauntlet,Sealed Deck)
Manalink 2016/08/27: Eldritch Moon v2, duel

What exactly should be the correct behavior/interaction ?
Lantern Spirit ability return to hand only one Lantern Spirit.Only the last activation-first to resolve finds a target to return the others don't.

Are any other cards possibly affected by this bug ?
-

Fixed in e1ed016.

The proper place to fix this is in bounce_permanent(), which should just fail if the given card is neither on the stack nor battlefield (and much of it should be skipped if the card's on the stack - Remand either any spell while a Warped Devotion is on the bf, or Remand a Warped Devotion itself, to see why). Otherwise you're going to be fixing this same bug over and over.

Ok, I am renaming this and leave it open for a proper fix when an actual developer is available. Unfortunately I can only follow the fix adopted for other cards like it.