Archmage of Runes 
Creature — Giant Wizard
$3.31 #924 0.33 1.9 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↓#9490.292.2 years
"Instant and sorcery spells you cast cost less to cast."
less to cast."
Goblin Electromancer97%
$0.21↓#673↑0.23↓14.1 years↑
"Instant and sorcery spells you cast cost less to cast."
less to cast."
Mocking Sprite97%
$0.19↓#2898↓0.08↓3.1 years↑
"Instant and sorcery spells you cast cost less to cast."
less to cast."
Arcane Melee96%
$0.37↓#11690↓0.3214.5 years↑
"Instant and sorcery spells cost 
less to cast."
less to cast."
Curious Homunculus // Voracious Reader95%
$0.32↓#9577↓0.12↓10.2 years↑
"Instant and sorcery spells you cast cost less to cast."
less to cast."
Case of the Ransacked Lab94%
$0.65↓#2852↓0.18↓2.7 years
"Solved — Whenever you cast an instant or sorcery spell, draw a card."
+1 more matching line
Haughty Djinn92%
$0.29↓#2551↓0.19↓4.1 years↑
"Instant and sorcery spells you cast cost less to cast."
less to cast."
Baral, Chief of Compliance90%
$3.40↑#1349↓1.21↑9.7 years↑
"Instant and sorcery spells you cast cost less to cast."
less to cast."
Urza, Lord Protector88%
$9.03↑#5931↓0.11↓3.9 years↑
"Artifact, instant, and sorcery spells you cast cost less to cast."
less to cast."
Spectacle Mage88%
$0.11↓#21241↓0.05↓5.5 years↑
"Instant and sorcery spells you cast with mana value 5 or greater cost less to cast."
less to cast."
Primal Amulet // Primal Wellspring87%
$10.59↑#2174↓0.319.1 years↑
"Instant and sorcery spells you cast cost less to cast."
less to cast."+1 more matching line
Melek, Reforged Researcher87%
$0.53↓#12752↓0.44↑2.7 years
"The first instant or sorcery spell you cast each turn costs less to cast."
less to cast."
Battlefield Thaumaturge87%
$0.25↓#14323↓0.4012.5 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."
Lunar Mystic86%
$0.21↓#19540↓0.23↓14.5 years↑
"Whenever you cast an instant spell, you may pay . If you do, draw a card."
. If you do, draw a card."
Ral, Monsoon Mage // Ral, Leyline Prodigy86%
$5.76↑#3576↓0.82↑2.3 years
"Instant and sorcery spells you cast cost less to cast."
less to cast."+1 more matching line
Mizzix of the Izmagnus86%
$0.84↓#6421↓0.75↑10.9 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%
$1.28↓#4045↓0.244.4 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%
$1.95↓#11796↓0.12↓5.5 years↑
"Instant and sorcery spells you cast cost less to cast."
less to cast."+1 more matching line
Mindsplice Apparatus85%
$1.01↓#3012↓0.313.7 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."
Storm Skreelix84%
$0.20↓#18537↓0.07↓5.1 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +2/+0 until end of turn."
+1 more matching line