Stormcatch Mentor {U}{R}
Creature — Otter Wizard
Haste
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
Instant and sorcery spells you cast cost {1} less to cast.
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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.
Primal Amulet // Primal Wellspring 100%
$13.51#2071
"Instant and sorcery spells you cast cost {1} less to cast."
Case of the Ransacked Lab 100%
$0.48#2607
"Instant and sorcery spells you cast cost {1} less to cast."
Dirgur Focusmage // Braingeyser 100%
$0.30#10531
"Instant and sorcery spells you cast cost {1} less to cast."
Curious Homunculus // Voracious Reader 100%
$0.29#9383
"Instant and sorcery spells you cast cost {1} less to cast."
+1 more matching line
Rowan, Scholar of Sparks // Will, Scholar of Frost 100%
$2.01#11180
"Instant and sorcery spells you cast cost {1} less to cast."
Baral, Chief of Compliance 100%
$2.50#1315
"Instant and sorcery spells you cast cost {1} less to cast."
Ral, Monsoon Mage // Ral, Leyline Prodigy 100%
$6.29#3628
"Instant and sorcery spells you cast cost {1} less to cast."
Font of Magic 94%
$0.41#12045
"Instant and sorcery spells you cast cost {1} less to cast for each time you've cast a commander from the command zone this game."
Vadrik, Astral Archmage 93%
$0.34#11429
"Instant and sorcery spells you cast cost {X} less to cast, where X is this card's power."
Spectacle Mage 90%
$0.17#20523
"Instant and sorcery spells you cast with mana value 5 or greater cost {1} less to cast."