Mox Diamond 
Artifact
$1117.50 #247 1.74 28.6 years
If this artifact would enter, you may discard a land card instead. If you do, put this artifact onto the battlefield. If you don't, put it into its owner's graveyard.
: Add one mana of any color.Click a line or tag to filter
Cards similar to Mox Diamond 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.
Mox Tantalite88%
$10.74↓#4420↓0.28↓7.4 years↓
": Add one mana of any color."
: Add one mana of any color."
Chrome Mox88%
$153.72↓#156↑1.49↓23.0 years↓
": Add one mana of any of the exiled card's colors."
: Add one mana of any of the exiled card's colors."
Mox Opal88%
$224.87↓#2441.39↓16.1 years↓
": Add one mana of any color. Activate only if you control three or more artifacts."
: Add one mana of any color. Activate only if you control three or more artifacts."
Manalith72%
$0.19↓#7225↓0.00↓15.3 years↓
": Add one mana of any color."
: Add one mana of any color."
Charcoal Diamond72%
$0.26↓#701↓0.06↓30.0 years↑
": Add 
."
: Add ."
Firemind Vessel72%
$0.22↓#4258↓0.00↓7.5 years↓
": Add two mana of different colors."
: Add two mana of different colors."
Prismatic Lens70%
$0.27↓#1660↓0.00↓20.0 years↓
"
, : Add one mana of any color."
, : Add one mana of any color."
Gilded Lotus70%
$0.68↓#412↓0.06↓23.0 years↓
": Add three mana of any one color."
: Add three mana of any one color."
Sol Grail70%
$0.28↓#24944↓0.24↓30.4 years↑
": Add one mana of the chosen color."
: Add one mana of the chosen color."
Fallow Wurm70%
$0.25↓#30761↓0.00↓29.4 years
"When this creature enters, sacrifice it unless you discard a land card."
Thundering Wurm70%
$1.81↓#31257↓0.00↓29.5 years
"When this creature enters, sacrifice it unless you discard a land card."