Rules glossary
↑ Parent rule: 202.3 The mana value of an object is a number equal to the total a…
202.3c The mana value 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 mana value of the copy is 0.
No sub-rules.