Raka Sanctuary {2}{R}
Enchantment
At the beginning of your upkeep, if you control a white or blue permanent, this enchantment deals 1 damage to target creature. If you control a white permanent and a blue permanent, this enchantment deals 3 damage instead.
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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.