701.42. Meld

Meld is a keyword action that appears in an ability on one card in a meld pair. To meld the two cards in a meld pair, put them onto the battlefield with their back faces up and combined. The resulting permanent is a single object represented by two cards. See rule 712, “Double-Faced Cards.”

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 objects that can’t be melded, they stay in their current zone.

Example: A player owns and controls Midnight Scavengers and a token that’s a copy of Graf Rats. At the beginning of combat, both are exiled but can’t be melded. Midnight Scavengers remains exiled and the exiled token ceases to exist.