Kasmina, Enigmatic Mentor 
Legendary Planeswalker — Kasmina
$0.23 #6668 0.48 7.3 years
Spells your opponents cast that target a creature or planeswalker you control cost 
more to cast.
more to cast.−2: Create a 2/2 blue Wizard creature token. Draw a card, then discard a card.
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Cards similar to Kasmina, Enigmatic Mentor 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.
Boreal Elemental83%
$0.18↓#28962↓0.27↓7.2 years
"Spells your opponents cast that target this creature cost more to cast."
more to cast."
Sphinx of New Prahv83%
$0.09↓#25291↓0.10↓7.6 years
"Spells your opponents cast that target this creature cost more to cast."
more to cast."
Jubilant Skybonder78%
$0.16↓#60990.13↓6.4 years
"Creatures you control with flying have "Spells your opponents cast that target this creature cost more to cast.""
more to cast.""
Icefall Regent76%
$0.47↑#12998↓0.65↑11.4 years↑
"Spells your opponents cast that target this creature cost more to cast."
more to cast."
Syr Elenora, the Discerning76%
$0.11↓#14125↓0.00↓6.9 years
"Spells your opponents cast that target this card cost more to cast."
more to cast."
Esior, Wardwing Familiar76%
$0.64↑#3368↑0.35↓5.8 years↓
"Spells your opponents cast that target one or more commanders you control cost more to cast."
more to cast."
Urza, Planeswalker74%
3.8 years↓
"+1: Draw two cards, then discard a card."
Charix, the Raging Isle74%
$0.44↑#3656↑0.24↓5.9 years↓
"Spells your opponents cast that target this card cost more to cast."
more to cast."
Elderwood Scion74%
$0.24↑#23415↓0.4214.3 years↑
"Spells your opponents cast that target this creature cost more to cast."
more to cast."
Pursued Whale74%
$0.22↓#16408↓0.386.2 years↓
"Spells your opponents cast that target this creature cost more to cast."
more to cast."
Callaphe, Beloved of the Sea74%
$0.20↓#75020.22↓6.6 years
"Creatures and enchantments you control have "Spells your opponents cast that target this permanent cost 
more to cast.""
more to cast.""
Monastery Siege72%
$0.68↑#59430.4611.6 years↑
"• Dragons — Spells your opponents cast that target you or a permanent you control cost more to cast."
more to cast."+1 more matching line
Teferi, Master of Time70%
$7.08↑#2212↑1.12↑6.2 years↓
"+1: Draw a card, then discard a card."