Horizon Stone 
Artifact
$1.14 #4127 0.32 5.9 years
If you would lose unspent mana, that mana becomes colorless instead.
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Cards similar to Horizon Stone 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.
Kruphix, God of Horizons90%
$3.30↑#48400.3912.5 years↑
"If you would lose unspent mana, that mana becomes colorless instead."
Omnath, Locus of the Void89%
$3.13↑#10185↓0.46↑0.0 years↓
"If you would lose unspent mana, that mana becomes colorless instead."
Omnath, Locus of All78%
$0.41↓#5499↓0.60↑3.5 years↓
"If you would lose unspent mana, that mana becomes black instead."
Ozai, the Phoenix King74%
$4.59↑#37930.51↑0.9 years↓
"If you would lose unspent mana, that mana becomes red instead."
Salvaged Manaworker71%
$0.13↓#24238↓0.21↓4.1 years↓
"
: Add one mana of any color. Activate only once each turn."
: Add one mana of any color. Activate only once each turn."
Scarecrow Guide71%
$0.24↓#14942↓0.00↓3.1 years↓
": Add one mana of any color. Activate only once each turn."
: Add one mana of any color. Activate only once each turn."
Orochi Leafcaller70%
$0.32↓#14391↓0.2622.1 years↑
"
: Add one mana of any color."
: Add one mana of any color."
Signpost Scarecrow70%
$0.14↓#19092↓0.00↓7.0 years↑
"
: Add one mana of any color."
: Add one mana of any color."
Mana Cylix70%
$0.09↓#22040↓0.00↓25.7 years↑
", 
: Add one mana of any color."
, : Add one mana of any color."
Viridian Acolyte70%
$0.12↓#26347↓0.00↓22.7 years↑
", : Add one mana of any color."
, : Add one mana of any color."