Horizon Stone 
Artifact
$1.23 #4114 0.43 5.8 years
If you would lose unspent mana, that mana becomes colorless instead.
Click a line or tag to filter
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 Horizons91%
$3.22↑#47250.24↓12.3 years↑
"If you would lose unspent mana, that mana becomes colorless instead."
Omnath, Locus of All78%
$0.44↓#5409↓0.53↑3.4 years↓
"If you would lose unspent mana, that mana becomes black instead."
Ozai, the Phoenix King74%
$3.88↑#39280.00↓0.8 years↓
"If you would lose unspent mana, that mana becomes red instead."
Salvaged Manaworker71%
$0.09↓#23985↓0.00↓4.0 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%
$0.27↓#14560↓0.00↓3.0 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↓#14610↓0.3321.9 years↑
"
: Add one mana of any color."
: Add one mana of any color."
Signpost Scarecrow70%
$0.12↓#18588↓0.476.9 years↑
"
: Add one mana of any color."
: Add one mana of any color."
Mana Cylix70%
$0.09↓#21797↓0.27↓25.6 years↑
", 
: Add one mana of any color."
, : Add one mana of any color."
Viridian Acolyte70%
$0.11↓#26078↓0.20↓22.6 years↑
", : Add one mana of any color."
, : Add one mana of any color."
Llanowar Envoy70%
$0.20↓#25907↓0.408.4 years↑
": Add one mana of any color."
: Add one mana of any color."
Nomadic Elf70%
$0.14↓#27613↓0.29↓25.9 years↑
": Add one mana of any color."
: Add one mana of any color."
Celestial Prism70%
$0.17↓#30168↓0.00↓33.1 years↑
", : Add one mana of any color."
, : Add one mana of any color."