Archmage of Runes 
Creature — Giant Wizard
$3.31 #954 0.31 1.8 years
Instant and sorcery spells you cast cost 
less to cast.
less to cast.Whenever you cast an instant or sorcery spell, draw a card.
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Cards similar to Archmage of Runes 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.
Stormcatch Mentor97%
$0.33↓#9430.242.1 years
"Instant and sorcery spells you cast cost less to cast."
less to cast."
Mocking Sprite97%
$0.18↓#2866↓0.16↓3.0 years↑
"Instant and sorcery spells you cast cost less to cast."
less to cast."
Goblin Electromancer97%
$0.21↓#661↑0.2614.0 years↑
"Instant and sorcery spells you cast cost less to cast."
less to cast."
Arcane Melee96%
$0.35↓#11492↓0.3014.3 years↑
"Instant and sorcery spells cost 
less to cast."
less to cast."
Curious Homunculus // Voracious Reader95%
$0.33↓#9470↓0.2910.1 years↑
"Instant and sorcery spells you cast cost less to cast."
less to cast."
Case of the Ransacked Lab94%
$0.47↓#2746↓0.272.6 years
"Solved — Whenever you cast an instant or sorcery spell, draw a card."
+1 more matching line
Haughty Djinn92%
$0.33↓#2496↓0.19↓4.0 years↑
"Instant and sorcery spells you cast cost less to cast."
less to cast."
Baral, Chief of Compliance90%
$3.36↑#1324↓1.06↑9.6 years↑
"Instant and sorcery spells you cast cost less to cast."
less to cast."
Urza, Lord Protector88%
$10.06↑#5843↓0.50↑3.8 years↑
"Artifact, instant, and sorcery spells you cast cost less to cast."
less to cast."
Ral, Monsoon Mage // Ral, Leyline Prodigy87%
$6.97↑#3603↓0.53↑2.2 years
"Instant and sorcery spells you cast cost less to cast."
less to cast."+1 more matching line
Primal Amulet // Primal Wellspring87%
$11.08↑#2132↓0.268.9 years↑
"Instant and sorcery spells you cast cost less to cast."
less to cast."+1 more matching line
Melek, Reforged Researcher87%
$0.54↓#12369↓0.292.6 years
"The first instant or sorcery spell you cast each turn costs less to cast."
less to cast."
Spectacle Mage87%
$0.15↓#20964↓0.255.4 years↑
"Instant and sorcery spells you cast with mana value 5 or greater cost less to cast."
less to cast."
Lunar Mystic86%
$0.21↓#19232↓0.09↓14.3 years↑
"Whenever you cast an instant spell, you may pay . If you do, draw a card."
. If you do, draw a card."
Storm Skreelix86%
$0.17↓#18105↓0.18↓4.9 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +2/+0 until end of turn."
+1 more matching line
Battlefield Thaumaturge86%
$0.29↓#14089↓0.53↑12.3 years↑
"Each instant and sorcery spell you cast costs less to cast for each creature it targets."
less to cast for each creature it targets."
Mizzix of the Izmagnus86%
$0.70↓#6304↓0.77↑10.8 years↑
"Whenever you cast an instant or sorcery spell with mana value greater than the number of experience counters you have, you get an experience counter."
+1 more matching line
Wizards of Thay86%
$1.52↓#3929↓0.244.2 years↑
"Instant and sorcery spells you cast cost less to cast."
less to cast."+1 more matching line
Rowan, Scholar of Sparks // Will, Scholar of Frost85%
$1.85↓#11567↓0.405.4 years↑
"Instant and sorcery spells you cast cost less to cast."
less to cast."+1 more matching line
Mindsplice Apparatus85%
$1.39↓#2913↓0.323.6 years↑
"Instant and sorcery spells you cast cost less to cast for each oil counter on this artifact."
less to cast for each oil counter on this artifact."