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Exile target spell, then roll a d20 and add that spell's mana value.
1—14 | You may cast the exiled card for as long as it remains exiled, and you may spend mana as though it were mana of any color to cast that spell.
15+ | You may cast the exiled card without paying its mana cost for as long as it remains exiled.
Gale's Redirection exiles the spell directly from the stack without countering it. Because of this, it's effective against spells that can't be countered.
If the exiled card is an adventurer card, you may cast the Adventure spell this way.
If the spell had {X} in its mana cost, X will be whatever value it had on the stack when calculating its mana value.
