Azor's Gateway // Sanctum of the Sun
{1}, {T}: Draw a card, then exile a card from your hand. If cards with five or more different mana values are exiled with Azor's Gateway, you gain 5 life, untap Azor's Gateway, and transform it.
(Transforms from Azor's Gateway.) {T}: Add X mana of any one color, where X is your life total.
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Official rulings (5) · Scryfall
If a card in exile has {X} in its mana cost, X is considered to be 0.
The mana value of a split card, such as a card with aftermath from the Amonkhet block, is based on the combined mana cost of its two halves. A split card doesn't have two mana values.
If an object has no mana cost, its mana value is 0. A mana value of 0 can still help unlock Azor's Gateway.
The ability of Sanctum of the Sun is a mana ability. It doesn't use the stack and can't be responded to.
The cards you exile from your hand are exiled face up.