Ruby Medallion 
Artifact
$13.06 #291 0.28 28.9 years
Red spells you cast cost 
less to cast.
less to cast.Click a line or tag to filter
Cards similar to Ruby Medallion 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.
Thornscape Familiar94%
$0.26↓#17790↓0.07↓25.6 years↓
"Red spells and white spells you cast cost less to cast."
less to cast."
Nightscape Familiar92%
$0.40↓#1152↓0.16↓25.6 years↓
"Blue spells and red spells you cast cost less to cast."
less to cast."
Goblin Anarchomancer91%
$0.43↓#550↓0.195.2 years↓
"Each spell you cast that's red or green costs less to cast."
less to cast."
The Fire Crystal90%
$6.25↓#916↓0.311.2 years↓
"Red spells you cast cost less to cast."
less to cast."
Hazoret's Monument84%
$1.48↓#1913↓0.13↓9.4 years↓
"Red creature spells you cast cost less to cast."
less to cast."
Stone Calendar82%
$14.67↑#20270↓0.48↑32.1 years↑
"Spells you cast cost less to cast."
less to cast."
Heartlash Cinder82%
$0.15↓#26340↓0.00↓18.1 years↓
"When this creature enters, it gets +X/+0 until end of turn, where X is the number of red mana symbols in the mana costs of permanents you control."
Mudbrawler Cohort81%
$0.13↓#26998↓0.2518.3 years↓
"This creature gets +1/+1 as long as you control another red creature."
Memory Crystal80%
$2.14↓#23969↓0.60↑28.2 years
"Buyback costs cost less."
less."
Defiler of Instinct77%
$0.43↓#4810↓0.17↓4.0 years↓
"As an additional cost to cast red permanent spells, you may pay 2 life. Those spells cost 
less to cast if you paid life this way. This effect reduces only the amount of red mana you pay."
less to cast if you paid life this way. This effect reduces only the amount of red mana you pay."
Rowan, Scion of War77%
$0.43↓#8750↓0.43↑3.0 years↓
"
: Spells you cast this turn that are black and/or red cost 
less to cast, where X is the amount of life you lost this turn. Activate only as a sorcery."
: Spells you cast this turn that are black and/or red cost less to cast, where X is the amount of life you lost this turn. Activate only as a sorcery."
Pearl Medallion76%
$5.55↓#454↓0.2328.9 years
"White spells you cast cost less to cast."
less to cast."
March of Reckless Joy76%
$0.26↓#7702↓0.10↓4.5 years↓
"As an additional cost to cast this spell, you may exile any number of red cards from your hand. This spell costs less to cast for each card exiled this way."
less to cast for each card exiled this way."
Jet Medallion76%
$12.06↓#2780.2228.9 years
"Black spells you cast cost less to cast."
less to cast."
Sapphire Medallion75%
$7.39↓#365↓0.3028.9 years
"Blue spells you cast cost less to cast."
less to cast."
Helm of Awakening74%
$1.51↓#1903↓0.3629.6 years
"Spells cost less to cast."
less to cast."
Raging Battle Mouse74%
$0.24↓#12241↓0.06↓3.0 years↓
"The second spell you cast each turn costs less to cast."
less to cast."
Highspire Bell-Ringer74%
$0.17↓#10995↓0.17↓1.4 years↓
"The second spell you cast each turn costs less to cast."
less to cast."
Uthros Psionicist74%
$0.31↓#9825↓0.231.1 years↓
"The second spell you cast each turn costs less to cast."
less to cast."
Urza's Filter72%
$4.79↓#14485↓0.3525.9 years↓
"Multicolored spells cost less to cast."
less to cast."