Rootwater Depths
Land
{T}: Add {C}.
{T}: Add {U} or {B}. This land doesn't untap during your next untap step.
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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.
Waterveil Cavern 100%
$0.19#23401
"{T}: Add {U} or {B}. This land doesn't untap during your next untap step."
+1 more matching line
Talisman of Dominance 97%
$0.83#91
"{T}: Add {U} or {B}. This artifact deals 1 damage to you."
+1 more matching line
Hidden Lair 97%
$3.41#12985
"{T}: Add {U} or {B}. Activate only if this land entered this turn or if you control a basic land."
+1 more matching line
Tainted Isle 96%
$2.21#498
"{T}: Add {U} or {B}. Activate only if you control a Swamp."
+1 more matching line
Underground River 96%
$1.61#150
"{T}: Add {U} or {B}. This land deals 1 damage to you."
+1 more matching line