107.3h

Normally, all instances of X on an object have the same value at any given time. If an object gains an ability, the value of X within that ability is the value defined by that ability, or 0 if that ability doesn't define a value of X.

Entreat the Angels. Entreat the Angels’s converted mana cost is based on its mana cost of XXWWWW, even if you're casting it for its miracle cost. For example, if you cast Entreat the Angels for its miracle cost and choose 4 for X, its converted mana cost is 11.