Historical Rules · 23 August 2019
Rule 202.3c
Official source text from the 23 August 2019 Rules release
The converted mana cost of a melded permanent is calculated as though it had the combined mana cost of the front faces of each card that represents it. If a permanent is a copy of a melded permanent (even if that copy is represented by two other meld cards), the converted mana cost of the copy is 0.