Spymaster's Vault
Land
This land enters tapped unless you control a Swamp.
{T}: Add {B}.
{B}, {T}: Target creature you control connives X, where X is the number of creatures that died this turn. (Draw X cards, then discard X cards. Put a +1/+1 counter on that creature for each nonland card discarded this way.)
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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.
Castle Locthwain 100%
$4.15#759
"This land enters tapped unless you control a Swamp."
+1 more matching line
Dalkovan Encampment 88%
$0.50#3597
"This land enters tapped unless you control a Swamp or a Mountain."
Witch's Cottage 85%
$1.05#877
"This land enters tapped unless you control three or more other Swamps."