Staff of the Sun Magus 
Artifact
$0.15 #13125 0.00 13.3 years
Whenever you cast a white spell or a Plains you control enters, you gain 1 life.
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Cards similar to Staff of the Sun Magus 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.
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"Whenever a land you control enters, you gain 1 life."
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"Whenever you cast a white spell, you gain 1 life."
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"Whenever you cast a white spell, you gain 3 life."
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$0.15#31995↓0.0028.3 years↑
"At the beginning of your upkeep, if all nonland permanents you control are white, you gain 1 life."
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$0.27↑#6287↑0.13↑7.0 years↓
"Whenever a white creature you control attacks, you gain 1 life."