Storm Skreelix 
Creature — Drake Horror
$0.20 #18537 0.07 5.1 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 Sprite97%
$0.19↓#2898↑0.083.1 years↓
"Instant and sorcery spells you cast cost less to cast."
less to cast."
Goblin Electromancer96%
$0.21↑#673↑0.23↑14.1 years↑
"Instant and sorcery spells you cast cost less to cast."
less to cast."
Stormcatch Mentor96%
$0.33↑#949↑0.29↑2.2 years↓
"Instant and sorcery spells you cast cost less to cast."
less to cast."
Jace's Sanctum95%
$0.57↑#4171↑0.20↑11.3 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."
Wee Dragonauts94%
$0.06↓#187060.28↑20.8 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +2/+0 until end of turn."
Mercurial Geists94%
$0.03↓#26102↓0.0610.2 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +3/+0 until end of turn."
Aven Wind Mage94%
$0.11↓#23341↓0.33↑8.3 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +1/+1 until end of turn."
Curious Homunculus // Voracious Reader94%
$0.32↑#9577↑0.1210.2 years↑
"Instant and sorcery spells you cast cost less to cast."
less to cast."+1 more matching line
Festival Crasher92%
$0.18↓#202550.005.1 years
"Whenever you cast an instant or sorcery spell, this creature gets +2/+0 until end of turn."
Kiln Fiend92%
$0.11↓#172480.0616.5 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +3/+0 until end of turn."
Fire Urchin92%
$0.05↓#25748↓0.008.0 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +1/+0 until end of turn."
Haughty Djinn92%
$0.29↑#2551↑0.19↑4.1 years
"Instant and sorcery spells you cast cost less to cast."
less to cast."
Spectacle Mage87%
$0.11↓#212410.055.5 years
"Instant and sorcery spells you cast with mana value 5 or greater cost less to cast."
less to cast."
Erratic Cyclops86%
$0.15↓#186930.19↑8.0 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +X/+0 until end of turn, where X is that spell's mana value."
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."
Urza, Lord Protector86%
$9.03↑#5931↑0.113.9 years↓
"Artifact, instant, and sorcery spells you cast cost less to cast."
less to cast."
Battlefield Thaumaturge86%
$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."
Blistercoil Weird85%
$0.25↑#22941↓0.0714.0 years↑
"Whenever you cast an instant or sorcery spell, this creature gets +1/+1 until end of turn. Untap it."
Pyre Hound85%
$0.07↓#193390.19↑10.5 years↑
"Whenever you cast an instant or sorcery spell, put a +1/+1 counter on this creature."