Historical Rules · 22 July 2016
Rule 701.34a
Official source text from the 22 July 2016 Rules release
Meld is a keyword action that appears in an ability on one card in a meld pair. (See rule 712, “Meld Cards.”) 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.