Hissing Quagmire
Land
This land enters tapped.
{T}: Add {B} or {G}.
{1}{B}{G}: Until end of turn, this land becomes a 2/2 black and green Elemental creature with deathtouch. It's still a land.
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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.
Restless Cottage 88%
$1.91#3166
"{2}{B}{G}: This land becomes a 4/4 black and green Horror creature until end of turn. It's still a land."
+2 more matching lines
Svogthos, the Restless Tomb 85%
$0.41#12106
"{3}{B}{G}: Until end of turn, this land becomes a black and green Plant Zombie creature with "This creature's power and toughness are each equal to the number of creature cards in your graveyard." It's still a land."