Charix, the Raging Isle {2}{U}{U}
Legendary Creature — Leviathan Crab
Spells your opponents cast that target Charix cost {2} more to cast.
{3}: Charix gets +X/-X until end of turn, where X is the number of Islands you control.
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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.
Syr Elenora, the Discerning 100%
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"Spells your opponents cast that target this card cost {2} more to cast."
Hinata, Dawn-Crowned 83%
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"Spells your opponents cast cost {1} more to cast for each target."