However, if you cast a spell from exile and then later that turn Wild-Magic Sorcerer comes under your control, Wild-Mage Sorcerer won't give cascade to any other spell you cast from exile that turn.
Wild-Magic Sorcerer
The mana value of a split card is determined by the combined mana cost of its two halves. If cascade allows you to cast a split card, you may cast either half but not both halves.
Cascade triggers when you cast the spell, meaning that it resolves before that spell. If you end up casting the exiled card, it will go on the stack above the spell with cascade.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Aaron J. Riley
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