Storm Skreelix 
Creature — Drake Horror
$0.17 #18105 0.18 4.9 years
Flying
Instant and sorcery spells you cast cost 
less to cast.
less to cast.Whenever you cast an instant or sorcery spell, this creature gets +2/+0 until end of turn.
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Cards similar to Storm Skreelix 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.
Mocking Sprite99%
$0.18↑#2866↑0.163.0 years↓
"Instant and sorcery spells you cast cost less to cast."
less to cast."+1 more matching line
Goblin Electromancer98%
$0.21↑#661↑0.2614.0 years↑
"Instant and sorcery spells you cast cost less to cast."
less to cast."
Stormcatch Mentor98%
$0.33↑#943↑0.242.1 years↓
"Instant and sorcery spells you cast cost less to cast."
less to cast."
Jace's Sanctum98%
$0.58↑#4173↑0.34↑11.1 years↑
"Instant and sorcery spells you cast cost less to cast."
less to cast."+1 more matching line
Arcane Melee97%
$0.35↑#11492↑0.30↑14.3 years↑
"Instant and sorcery spells cost 
less to cast."
less to cast."
Curious Homunculus // Voracious Reader96%
$0.33↑#9470↑0.29↑10.1 years↑
"Instant and sorcery spells you cast cost less to cast."
less to cast."+1 more matching line
Haughty Djinn96%
$0.33↑#2496↑0.194.0 years
"Instant and sorcery spells you cast cost less to cast."
less to cast."+1 more matching line
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 Protector90%
$10.06↑#5843↑0.50↑3.8 years↓
"Artifact, instant, and sorcery spells you cast cost less to cast."
less to cast."
Spectacle Mage90%
$0.15↓#209640.255.4 years
"Instant and sorcery spells you cast with mana value 5 or greater cost less to cast."
less to cast."
Battlefield Thaumaturge88%
$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."
Archmage of Runes86%
$3.31↑#954↑0.31↑1.8 years↓
"Whenever you cast an instant or sorcery spell, draw a card."
+1 more matching line
Thunderclap Drake86%
$0.54↑#2147↑0.192.4 years↓
"Instant and sorcery spells you cast cost less to cast."
less to cast."
Mindsplice Apparatus86%
$1.39↑#2913↑0.32↑3.6 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."
Wee Dragonauts86%
$0.05↓#183580.29↑20.7 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +2/+0 until end of turn."
Mercurial Geists86%
$0.04↓#25774↓0.2510.1 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +3/+0 until end of turn."
Aven Wind Mage86%
$0.08↓#23016↓0.31↑8.1 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +1/+1 until end of turn."
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
Festival Crasher85%
$0.17#199950.224.9 years
"Whenever you cast an instant or sorcery spell, this creature gets +2/+0 until end of turn."
Kiln Fiend85%
$0.10↓#169470.2716.4 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +3/+0 until end of turn."