Skyclave Apparition
When this creature enters, exile up to one target nonland, nontoken permanent you don't control with mana value 4 or less. When this creature leaves the battlefield, the exiled card's owner creates an X/X blue Illusion creature token, where X is the mana value of the exiled card.
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Official rulings (4) · Scryfall
If a creature on the battlefield has {X} in its mana cost, X is considered to be 0.
If Skyclave Apparition's first ability exiled more than one card owned by a single player, that player creates a token with power and toughness equal to the sum of those cards' mana values. If the first ability exiled cards owned by more than one player, each of those players creates a token with power and toughness equal to the sum of the mana values of all cards exiled by the first ability.
If Skyclave Apparition leaves the battlefield before its first ability resolves, the ability still exiles the target permanent.
If there's no exiled card when Skyclave Apparition leaves the battlefield (most likely because its first ability hasn't resolved yet), no player creates a token.