Great Hall of the Biblioplex
Land
{T}: Add {C}.
{T}, Pay 1 life: Add one mana of any color. Spend this mana only to cast an instant or sorcery spell.
{5}: If this land isn't a creature, it becomes a 2/4 Wizard creature with "Whenever you cast an instant or sorcery spell, this creature gets +1/+0 until end of turn." 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.
Voldaren Estate 99%
$0.27#2428
"{T}, Pay 1 life: Add one mana of any color. Spend this mana only to cast a Vampire spell."
+1 more matching line
Corrupted Crossroads 99%
$0.14#5896
"{T}, Pay 1 life: Add one mana of any color. Spend this mana only to cast a spell with devoid."
+1 more matching line
Spire of Industry 99%
$0.31#393
"{T}, Pay 1 life: Add one mana of any color. Activate only if you control an artifact."
+1 more matching line
Thieving Varmint 88%
$3.47#4466
"{T}, Pay 1 life: Add two mana of any one color. Spend this mana only to cast spells you don't own."
Horizon of Progress 81%
$6.28#1481
"{T}, Pay 1 life: Add one mana of any type that a land you control could produce."