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Describe the Bug:
(Sorry, I hate bug reports that just have a cardname in them too, but there isn't any part of this card that's right.)

Moonmist currently:

• Transforms all Human Werewolves. Even the non-dfc ones.
• Prevents combat damage that would be dealt this turn by permanents that, at the time it's cast, are creatures, are on the battlefield, and aren't Wolves or Werewolves.

Which card did behave improperly ?
Moonmist.

Which update are you using?(date,name)Which type(Duel,Gauntlet,Sealed Deck)
Post-BFZ dev.

What exactly should be the correct behavior/interaction ?

• Transform all Humans that are represented by double-faced cards. Not any of:
  • tokens (like from Dance of Many)
  • copies (like from Clone), unless they're are also represented by dfcs (like a Ravenous Demon // Archdemon of Greed card that was changed into a Benalish Hero by a Mirrorweave)
  • dfcs whose other sides are instants or sorceries (like the back of a Startled Awake // Persistent Nightmare card that was also changed into a Benalish Hero by a Mirrorweave)
  • especially, random non-dfc cards that happen to be humans and werewolves (like either side of a Budoka Gardener // Dokai, Weaver of Life cast after a Xenograft choosing "Werewolf" - though note that Xenograft is, unrelatedly, broken so it only adds subtypes to creatures that enter the battlefield after it does). (Now that I think of it, one of the gains-all-creature-types spells like Wings of Velis Vel would make for an easier test. Most manlands should be susceptible, for example.)
  Rule 711.5: "Only permanents represented by double-faced cards can transform. (See rule 701.25, "Transform.") If a spell or ability instructs a player to transform any permanent that isn't represented by a double-faced card, nothing happens.";
  Rule 701.25d: "If a spell or ability instructs a player to transform a permanent, and the face that permanent would transform into is represented by an instant or sorcery card face, nothing happens."
• Not care at all whether the cards it's transforming are Werewolves. List of transformable non-werewolf humans (not including EMN ones yet, but there's still lots).
• Prevent combat damage dealt any time this turn by a creature that's neither a Wolf or a Werewolf at the time the damage is dealt.

Now that I've typed that out, I see that Moonmist's rulings and reminder text address most of what I wrote above more clearly and concisely.

Are any other cards possibly affected by this bug ?
Geier Reach Bandit // Vildin-Pack Alpha is in shadows_over_innistrad.c and I see it just looks for subtype Werewolf, so it'll have all the same problems that the transformation part of Moonmist does. I already knew to skip porting EMN's Waxing Moon from Shandalar.

Copies of dfcs and token copies of dfcs can incorrectly transform themselves, too, using the abilities they're copying.

About Moonmist: 90% fixed in 060e480. I don't know if all the interactions with "flip-cards" are correct...
Xenograft fixed in dfe177a

060e480 doesn't take care of any of the interactions with flip cards. What it did was to fix the prevent-damage part (correctly), and to make it transform all Humans instead of all Human Werewolves. Everything in the first bullet point is just as broken, except now you don't need a Xenograft or Wings of Velis Vel or whatever to make them be werewolves to.

What's needed is to check in transform() that A) the card isn't a token, and B) that the card's original_internal_card_id is that of a card that can transform.

After the last changes in dev either it doesn't transform at all or instead of transforming the proper cards transformed a land into an Air Elemental.