Mystic Skull // Mystic Monstrosity
Artifact // Artifact Creature — Construct
{1}, {T}: Add one mana of any color.
{5}, {T}: Transform this artifact.
Lands you control have "{T}: Add one mana of any color."
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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.
Chromatic Lantern 100%
$0.79#84
"Lands you control have "{T}: Add one mana of any color.""
+1 more matching line
Greenhouse // Rickety Gazebo 100%
$0.22#6609
"Lands you control have "{T}: Add one mana of any color.""
The World Tree 87%
$5.67#801
"As long as you control six or more lands, lands you control have "{T}: Add one mana of any color.""
Resonating Lute 85%
$1.53#3793
"Lands you control have "{T}: Add two mana of any one color. Spend this mana only to cast instant and sorcery spells.""
Divergent Growth 80%
$0.13#26224
"Until end of turn, lands you control gain "{T}: Add one mana of any color.""
Great Divide Guide 80%
$0.95#3067
"Each land and Ally you control has "{T}: Add one mana of any color.""