Mox Diamond 
Artifact
$1146.91 #247 1.47 28.5 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 Tantalite89%
$11.75↓#4373↓0.65↓7.2 years↓
": Add one mana of any color."
: Add one mana of any color."
Mox Opal88%
$236.07↓#2421.18↓15.9 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."
Chrome Mox88%
$154.05↓#148↑1.4722.9 years↓
": Add one mana of any of the exiled card's colors."
: Add one mana of any of the exiled card's colors."
Manalith72%
$0.17↓#7113↓0.00↓15.1 years↓
": Add one mana of any color."
: Add one mana of any color."
Charcoal Diamond72%
$0.26↓#692↓0.00↓29.9 years↑
": Add 
."
: Add ."
Firemind Vessel72%
$0.18↓#4236↓0.29↓7.3 years↓
": Add two mana of different colors."
: Add two mana of different colors."
Prismatic Lens70%
$0.26↓#1654↓0.40↓19.9 years↓
"
, : Add one mana of any color."
, : Add one mana of any color."
Gilded Lotus70%
$0.53↓#411↓0.06↓22.9 years↓
": Add three mana of any one color."
: Add three mana of any one color."
Sol Grail70%
$0.29↓#24614↓0.21↓30.2 years↑
": Add one mana of the chosen color."
: Add one mana of the chosen color."
Thundering Wurm70%
$1.71↓#30953↓0.42↓29.3 years
"When this creature enters, sacrifice it unless you discard a land card."
Fallow Wurm70%
$0.24↓#30392↓0.53↓29.2 years
"When this creature enters, sacrifice it unless you discard a land card."