Jace's Sanctum 
Enchantment
$0.57 #4171 0.20 11.3 years
Instant and sorcery spells you cast cost 
less to cast.
less to cast.Whenever you cast an instant or sorcery spell, scry 1.
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Cards similar to Jace's Sanctum 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 Mentor96%
$0.33↓#949↑0.292.2 years↓
"Instant and sorcery spells you cast cost less to cast."
less to cast."
Goblin Electromancer96%
$0.21↓#673↑0.2314.1 years↑
"Instant and sorcery spells you cast cost less to cast."
less to cast."
Mocking Sprite96%
$0.19↓#2898↑0.08↓3.1 years↓
"Instant and sorcery spells you cast cost less to cast."
less to cast."
Storm Skreelix95%
$0.20↓#18537↓0.07↓5.1 years↓
"Instant and sorcery spells you cast cost less to cast."
less to cast."+1 more matching line
Arcane Melee95%
$0.37↓#11690↓0.32↑14.5 years↑
"Instant and sorcery spells cost 
less to cast."
less to cast."
Prescient Chimera94%
$0.11↓#22669↓0.00↓13.1 years↑
"Whenever you cast an instant or sorcery spell, scry 1."
Eyes of the Watcher94%
$0.34↓#22151↓0.00↓22.4 years↑
"Whenever you cast an instant or sorcery spell, you may pay . If you do, scry 2."
. If you do, scry 2."
Curious Homunculus // Voracious Reader92%
$0.32↓#9577↓0.1210.2 years↓
"Instant and sorcery spells you cast cost less to cast."
less to cast."
Haughty Djinn90%
$0.29↓#2551↑0.194.1 years↓
"Instant and sorcery spells you cast cost less to cast."
less to cast."
Dirgur Focusmage // Braingeyser89%
$0.31↓#8056↓0.180.5 years↓
"Instant and sorcery spells you cast cost less to cast."
less to cast."+1 more matching line
Baral, Chief of Compliance86%
$3.40↑#1349↑1.21↑9.7 years↓
"Instant and sorcery spells you cast cost less to cast."
less to cast."
Primal Amulet // Primal Wellspring86%
$10.59↑#2174↑0.31↑9.1 years↓
"Instant and sorcery spells you cast cost less to cast."
less to cast."+1 more matching line
Urza, Lord Protector86%
$9.03↑#5931↓0.113.9 years↓
"Artifact, instant, and sorcery spells you cast cost less to cast."
less to cast."
Spectacle Mage85%
$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."
Battlefield Thaumaturge84%
$0.25↓#14323↓0.40↑12.5 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."
Wizards of Thay84%
$1.28↑#40450.244.4 years↓
"Instant and sorcery spells you cast cost less to cast."
less to cast."+1 more matching line
Thunderclap Drake82%
$0.85↑#2177↑0.36↑2.5 years↓
"Instant and sorcery spells you cast cost less to cast."
less to cast."
Mindsplice Apparatus82%
$1.01↑#3012↑0.31↑3.7 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."
Ral, Monsoon Mage // Ral, Leyline Prodigy81%
$5.76↑#35760.82↑2.3 years↓
"Instant and sorcery spells you cast cost less to cast."
less to cast."+1 more matching line
Archmage of Runes80%
$3.31↑#924↑0.33↑1.9 years↓
"Whenever you cast an instant or sorcery spell, draw a card."
+1 more matching line