Heidar, Rimewind Master {4}{U}
Legendary Creature — Human Wizard
{2}, {T}: Return target permanent to its owner's hand. Activate only if you control four or more snow permanents.
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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.