The funny part is that the information about CMC of the back/Night side is not in the official article. It's mostly via employees of WotC saying so.
Except it is one the dedicated DFC rules page if you apply some basic rules knowledge.
Quote from Double faced cards Rules »
Double-Faced Cards in General
A double-faced card has two faces. It has no regular Magic back. Its front face, which is marked with a sun symbol and has a mana cost, is the default. A double-faced card always enters the battlefield with its front face up. This is true whether it enters the battlefield from the stack as the result of being cast, or from anywhere else, such as your graveyard (due to a card like Zombify, for example).
The back face of a double-faced card is marked with a moon symbol, lacks a mana cost, and has a color indicator—that's the dot on its type line—that tells you what color it is. The two faces of a double-faced card are often the same color, but not always. The back face's characteristics matter only if the card is on the battlefield and its back face is showing. Otherwise, only the front face's characteristics count. (For example, Gatstaf Shepherd's converted mana cost when it's in your deck is 2, not zero.)
Each double-faced card has at least one ability that causes it to transform. To transform a double-faced card, you turn it over so that its other face is showing.
The CMC is derived from the mana cost of the object, if the object has no mana cost the CMC is 0 same as for most tokens and lands.
Private Mod Note
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Rollback Post to RevisionRollBack
Every normal man must be tempted, at times, to spit on his hands, hoist the black flag and start slitting throats.
- H.L Mencken
I Became insane with long Intervals of horrible Sanity
All Religion, my friend is simply evolved out of fraud, fear, greed, imagination and poetry.
- Edgar Allan Poe
To give a judges' opinion on the question that arises from Illusionary Mask and a DFC/proxy, for purposes of Ixidron, the card is face down. For purposes of Illusionary Mask, the information about the card leaves it in exile face down. Since a card face down in exile is private information, I feel that a DFC removed with an Illusionary Mask will be hidden under Illusionary Mask as normal, especially since the checklist represents the card in all private zones.
And fnord, as far as Tempest Efreet goes, you now own the checklist, which represents the DFC. Everywhere except America, paper money represents an amount of gold equal to the denomination printed. Therefore, you get a checklist card that means you own the card it represents. ;-)
If a DFC is flipped, and it's then exiled with something like an o-ring, when the enchantment is removed and the DFC comes back to the battlefiled, which side is active?
That was my call during the release event this weekend, but two other players argued against it and when the employee running the event was called over for arbitration, he ruled it was the same condition it left in. So bogus.
Private Mod Note
():
Rollback Post to RevisionRollBack
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Except it is one the dedicated DFC rules page if you apply some basic rules knowledge.
The CMC is derived from the mana cost of the object, if the object has no mana cost the CMC is 0 same as for most tokens and lands.
- H.L Mencken
I Became insane with long Intervals of horrible Sanity
All Religion, my friend is simply evolved out of fraud, fear, greed, imagination and poetry.
- Edgar Allan Poe
The Crafters' Rules Guru
And fnord, as far as Tempest Efreet goes, you now own the checklist, which represents the DFC. Everywhere except America, paper money represents an amount of gold equal to the denomination printed. Therefore, you get a checklist card that means you own the card it represents. ;-)