Only two cards belonging to the same meld pair can be melded. Tokens, cards that aren't meld cards, or meld cards that don't form a meld pair can't be melded. If an effect instructs a player to meld cards that can't be melded, those cards remain in exile.
Note that the permanent represented by the combined back faces is colorless unless it has a color indicator.
A token that is created as a copy of a double-faced permanent or a double-faced card in another zone is a double-faced token. It will have both the front face and back face of whatever object it's copying. If it's copying a double-faced permanent whose back face is up, the token will enter with its back face up. It can transform if instructed to do so.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Simon Dominic
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A player prompted to name a card may name the combined back face, and each player has the right to know that combined back face's characteristics at all times.
Each face of a nonmodal double-faced card has its own set of characteristics: name, types, subtypes, abilities, and so on. While a nonmodal double-faced permanent is on the battlefield, consider only the characteristics of the face that's currently up. The other set of characteristics is ignored.
The mana value of a melded permanent is the sum of the mana values of its front faces. A permanent that becomes a copy of a melded permanent has only the characteristics of that combined back face, and its mana value is 0.
When two cards (for example, Fang, Fearless l'Cie and Vanille, Cheerful l'Cie) are melded, the result is a single permanent (in this case, Ragnarok, Divine Deliverance) that's represented by two cards. If the melded permanent goes to your graveyard from the battlefield, both cards are put into your graveyard. As the melded permanent leaves the battlefield, both of those cards are turned face up again. If the cards are put on the top or bottom of a library, their owner chooses their relative order.
While a meld card is in any zone other than the battlefield, it has only the characteristics of its front face. The same is true while it's on the battlefield with its front face up.
While a melded permanent is on the battlefield, it has only the characteristics of its combined back face. Any effects that modify how the new object enters the battlefield will consider only the combined back face.
One card in each pair of meld cards has an ability that instructs you to exile the two cards and meld them. If you control more than one object with the specified name, you select one object with that name to exile.
If an effect moves a melded permanent to a new zone and then affects "that card," it affects both cards.
When two cards are exiled and melded, they each leave the battlefield, then return together as one new untapped object with no relation to either of the objects that left the battlefield. Counters, Auras, Equipment, and other effects that affected those two cards don't affect the melded permanent.
The mana value of a nonmodal double-faced card is the mana value of its front face, no matter which face is up.
Each nonmodal double-faced card in this release is cast face up. In every zone other than the battlefield, consider only the characteristics of its front face. If it is on the battlefield, consider only the characteristics of the face that's up; the other face's characteristics are ignored.
In the Commander variant, a double-faced card's color identity is determined by the mana costs and mana symbols in the rules text of both faces combined. If either face has a color indicator or basic land type, those are also considered. For example, Cecil, Dark Knight's color identity is black and white, since its front face is black and its back face has a white color indicator.
If you are instructed to put a card that isn't a double-faced card onto the battlefield transformed, it will not enter at all. In that case, it stays in the zone it was previously in. For example, if a single-faced card is a copy of Crystal Fragments, it will be exiled during the resolution of its second ability and remain in exile.
In the Commander variant, a meld card's color identity is determined only by the mana costs and mana symbols in the rules text of its front face. No symbols or rules text of the permanent it melds into are considered.
The back face of a nonmodal double-faced card usually has a color indicator that defines its color.
A nonmodal double-faced card enters with its front face up by default, unless a spell or ability instructs you to put it onto the battlefield transformed or allows you to cast it transformed, in which case it enters with its back face up.
