I prefer the black cat to the cold wraith.
For the cold wraith there must be a freezing and therefore the use of glacial shard, you may not have both cards in the hand. On the other hand, the cat always draw and can do 5 damage to flamestrike.
As for nightmare amalgam I do not even like it, you are an elemental with a good body, but what would I replace? I prefer the elementals that I entered.

For now I think this archetype can not be done better than that. I wait for all the cards of the next expansion to make a possible change.

Firefly and Glacialshard do not rotate. The only cards that go in rotation are those belonging to: Mean Streets of Gadgetzan, Whisper of the Old Gods and One Night in Karazhan.

There are also other cards that can enter this deck.

I’m curious to know how “Chameleos” behaves, I could even prefer it to malygos.

Other interesting cards to insert could be:
– Twilight Acolyte
– Cabal Shadow Priest
– Eternal Servitude

Malygos is not an essential card for this deck, but it is still good inside. I recommend inserting it only if you own it.

I entered it for 2 reasons:
1) Very powerful if you played the Lady in White first.
2) is a dragon and can be recruited thanks to Dragonhatcher

But it is not a compulsory card, it can be replaced well with Holy Nova or Spirit Lash