Meld is a keyword action that means to turn two meld cards on the back side into one oversized card, if you control the proper pair. It was introduced in Eldritch Moon with three pairs. Meld returned with three more meld pairs in The Brothers' War. The design of Meld was inspired by the Un-card B.F.M. (Big Furry Monster) and the unreleased mechanic Link. Two cards that meld change into one oversized card on the battlefield. That single card only exists on the backs of the two other cards. A meld
Substitute card - MTG Wiki
[LCC] Tetzin, Gnome Champion // The Golden-Gear Colossus - Set Booster Exclusive (WeeklyMTG) : r/magicTCG
A Proper Count of Flavor Texts : r/magicTCG
Meld, Magic: The Gathering Wiki
First Pick At Eldritch Moon - Star City Games
Meld card - MTG Wiki
Keyword ability - MTG Wiki
Card back - MTG Wiki
Meld - MTG Wiki
Does Brought Back work with cards that were melded before going into the graveyard? : r/mtgrules