Shivan Reef
Land
{T}: Add {C}.
{T}: Add {U} or {R}. This land deals 1 damage to you.
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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.
Caldera Lake 100%
#20011
"{T}: Add {U} or {R}. This land deals 1 damage to you."
+1 more matching line
The Emperor of Palamecia // The Lord Master of Hell 100%
$0.23#4997
"{T}: Add {U} or {R}. Spend this mana only to cast a noncreature spell."