Focus the Mind {4}{U}
Instant
This spell costs {2} less to cast if you've cast another spell this turn.
Draw three cards, then discard a card.
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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.
Rally the Monastery 100%
$0.25#12529
"This spell costs {2} less to cast if you've cast another spell this turn."
Gigastorm Titan 95%
$0.12#23676
"This spell costs {3} less to cast if you've cast another spell this turn."
Thrasta, Tempest's Roar 89%
$0.66#9357
"This spell costs {3} less to cast for each other spell cast this turn."
Norman Osborn // Green Goblin 86%
$18.99#5662
"Spells you cast from your graveyard cost {2} less to cast."
Emet-Selch of the Third Seat 86%
$0.34#3271
"Spells you cast from your graveyard cost {2} less to cast."
Macabre Reconstruction 85%
$0.10#14990
"This spell costs {2} less to cast if a creature card was put into your graveyard from anywhere this turn."
Breaking Wave 85%
$0.70#21927
"You may cast this spell as though it had flash if you pay {2} more to cast it."
Rout 85%
$0.41#7784
"You may cast this spell as though it had flash if you pay {2} more to cast it."