Dual Strike {R}{R}
Instant
When you next cast an instant or sorcery spell with mana value 4 or less this turn, copy that spell. You may choose new targets for the copy.
Foretell {R} (During your turn, you may pay {2} and exile this card from your hand face down. Cast it on a later turn for its foretell cost.)
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Cards that do something similar 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.
Gadwick's First Duel 100%
$0.14#19350
"When you next cast an instant or sorcery spell with mana value 3 or less this turn, copy that spell. You may choose new targets for the copy."
Seifer Almasy 86%
$0.23#10671
"Whenever this card deals combat damage to a player, you may cast target instant or sorcery card with mana value 3 or less from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead."
Founding the Third Path 84%
$0.23#13699
"You may cast an instant or sorcery spell with mana value 1 or 2 from your hand without paying its mana cost."
+1 more matching line
Finale of Promise 83%
$1.28#5343
"You may cast up to one target instant card and/or up to one target sorcery card from your graveyard each with mana value X or less without paying their mana costs. If a spell cast this way would be put into your graveyard, exile it instead. If X is 10 or more, copy each of those spells twice. You may choose new targets for the copies."
Storm of Memories 83%
$0.36#14459
"Exile an instant or sorcery card with mana value 3 or less from your graveyard at random. You may cast it without paying its mana cost. If that spell would be put into a graveyard, exile it instead."
Unbound Flourishing 83%
$2.17#2696
"Whenever you cast an instant or sorcery spell or activate an ability, if that spell's mana cost or that ability's activation cost contains {X}, copy that spell or ability. You may choose new targets for the copy."
Arcane Bombardment 81%
$7.57#2233
"Whenever you cast your first instant or sorcery spell each turn, exile an instant or sorcery card at random from your graveyard. Then copy each card exiled with this enchantment. You may cast any number of the copies without paying their mana costs."
The Scarlet Witch 81%
$0.75#14538
"Instant and sorcery spells you cast with mana value 4 or greater cost {X} less to cast, where X is this card's power."
Thousand-Year Storm 80%
$1.37#1394
"Whenever you cast an instant or sorcery spell, copy it for each other instant and sorcery spell you've cast before it this turn. You may choose new targets for the copies."
Invoke Calamity 80%
$0.50#4131
"You may cast up to two instant and/or sorcery spells with total mana value 6 or less from your graveyard and/or hand without paying their mana costs. If those spells would be put into your graveyard, exile them instead. Exile this card."
Spectacle Mage 80%
$0.17#20523
"Instant and sorcery spells you cast with mana value 5 or greater cost {1} less to cast."