Rule 712.4 · Double-Faced Cards

One card in each meld pair has an ability that exiles both that object and its counterpart and melds them. To meld the two cards in a meld pair, put them onto the battlefield with their back faces up and combined (see rule 701.42, “Meld”). The resulting permanent is a single object represented by two cards.

The back faces of a meld pair are used only to determine the characteristics of the melded permanent that pair becomes on the battlefield. If a rule or effect references the back face of a meld card when not part of a melded permanent on the battlefield, it fails to determine its characteristics, regardless of which parts of the melded permanent is represented on that card’s back face.

Unlike other double-faced cards, meld cards cannot be transformed or converted. Any instructions to do so are ignored.