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Describe the Bug:
1- Molting Snakeskin doesn't put regeneration icon on creature and AI doesn't get enchanted creature has regeneration ability.
2- When activate to regenerate creature it produces dump error and doesn't regenerate the creature.

dump error | Open

bad parameters
in_play(-1, -1)
0: 0x024294C4
1: 0x023E310B
2: 0x023D2128
3: 0x023D217F
4: 0x0219D6C5
5: 0x004018E0
6: 0x004A2806
7: 0x02434CD5
8: 0x023ED6CD
9: 0x023ED717
10: 0x023EDDBE
11: 0x004368C6
12: 0x023EAAA8
13: 0x0047674E
14: 0x00436D07
15: 0x00436A80
16: 0x00477AD2
17: 0x004B37D7
18: 0x0043CD3D
19: 0x004399BD
20: 0x0047902C
21: 0x004946E9
22: 0x7C80B729

3- Legacy card is not attached to creature.
Which card did behave improperly ?
Molting Snakeskin

Which update are you using?(date,name)Which type(Duel,Gauntlet,Sealed Deck)
Manalink 2016/01/15: Battle For Zendikar v2,duel

What exactly should be the correct behavior/interaction ?
1- Molting Snakeskin puts regeneration icon on creature and AI gets enchanted creature has regeneration ability.
2- When activate to regenerate creature it produces dump error and doesn't regenerate the creature.
3- Legacy card is attached to creature.
Are any other cards possibly affected by this bug ?
-

Fixed in 6d05202
If you enchant an opponent's creature, opponent will be able to use the regeneration effect via an effect card (otherwise it will be impossible).
If the enchanted creature is stolen via Control Magic and so... Next question?

Works fine, but... Change of control not handled. Should this be waitlisted, or is it something that will never happen?

To make it clear the "If you enchant an opponent's creature, opponent will be able to use the regeneration effect via an effect card" part works fine but Change of control doesn't.