Artisan of Forms says:
Heroic — Whenever you cast a spell that targets Artisan of Forms, you may have Artisan of Forms become a copy of target creature and gain this ability.
Say I play a Gift of Immortality on it which says:
Enchant creature. When enchanted creature dies, return that card to the battlefield under its owner's control. Return Gift of Immortality to the battlefield attached to that creature at the beginning of the next end step.
Artisan of Forms' ability triggers and I make it a copy of another creature. Then my opponent destroys it. The way I would interpret the card is that Gift of Immortality will return Artisan of Forms to the battlefield in it's original form but it also seems plausible to me that it would still be a copy.
In the event it does return to it's original form can Gift of Immortality still "find" Artisan of Forms to reattach given it is now a different creature?