Gale's Redirection 
Instant
$0.33 #9132 0.25 4.2 years
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.
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Cards similar to Gale's Redirection expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Smirking Spelljacker88%
$1.93↑#6995↑0.47↑2.4 years↓
"Whenever this creature attacks, if a card is exiled with it, you may cast the exiled card without paying its mana cost."
+1 more matching line
Shell of the Last Kappa78%
$0.68↑#22109↓0.53↑21.9 years↑
", 
, Sacrifice this card: You may cast a spell from among cards exiled with this card without paying its mana cost."
, , Sacrifice this card: You may cast a spell from among cards exiled with this card without paying its mana cost."
Forceful Denial74%
$0.21↓#93450.305.8 years↑
"Cascade When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order."
Thranduil's Decree72%
$0.28↓#19140↓0.00↓0.1 years↓
"Counter target spell. If a permanent spell is countered this way, exile it instead of putting it into its owner's graveyard. You may cast that card without paying its mana cost for as long as it remains exiled."
Spelljack71%
$1.55↑#16871↓0.53↑24.3 years↑
"Counter target spell. If that spell is countered this way, exile it instead of putting it into its owner's graveyard. You may play it without paying its mana cost for as long as it remains exiled."
Kefka, Dancing Mad70%
$0.39↑#4105↑0.59↑1.2 years↓
"At the beginning of your end step, exile a card at random from each opponent's graveyard. You may cast any number of spells from among cards exiled this way without paying their mana costs. Then each player who owns a spell you cast this way loses life equal to its mana value."
Omniscience70%
$6.14↑#1022↑1.72↑14.1 years↑
"You may cast spells from your hand without paying their mana costs."