Herald of Slaanesh 
Creature — Demon
$4.87 #5947 0.67 4.0 years
Locus of Slaanesh — Demon spells you cast cost less to cast.
less to cast.Other Demons you control have haste.
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Cards similar to Herald of Slaanesh 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.
Planar Gate78%
$74.69↑#21434↓0.38↓32.4 years↑
"Creature spells you cast cost less to cast."
less to cast."
Ancient Cellarspawn77%
$6.70↑#2514↑0.27↓2.1 years↓
"Each spell you cast that's a Demon, Horror, or Nightmare costs 
less to cast."
less to cast."
Fervor77%
$2.07↓#3540↑0.21↓29.4 years↑
"Creatures you control have haste."
Emblem of the Warmind77%
$0.56↓#14693↓0.24↓19.5 years↑
"Creatures you control have haste."
Goblin Warchief76%
$1.04↓#2067↑0.32↓23.4 years↑
"Goblins you control have haste."
+1 more matching line
Tuktuk Rubblefort76%
$0.27↓#8061↓0.05↓6.1 years↑
"Creatures you control have haste."
Fires of Yavimaya75%
$0.31↓#3379↑0.16↓26.0 years↑
"Creatures you control have haste."
Samut, Hazoret's Champion74%
$2.73↓#7677↓0.41↓0.0 years↓
"Creatures you control have haste."
Cyclops of Eternal Fury74%
$0.17↓#16456↓0.00↓12.5 years↑
"Creatures you control have haste."
Madrush Cyclops74%
$0.33↓#23500↓0.28↓17.5 years↑
"Creatures you control have haste."
Starnheim Aspirant74%
$2.80↓#2988↑0.27↓5.7 years↑
"Angel spells you cast cost less to cast."
less to cast."
Honest Rutstein72%
$0.38↓#1855↑0.16↓2.5 years↓
"Creature spells you cast cost less to cast."
less to cast."
Otepec Huntmaster72%
$0.38↓#3147↑0.14↓9.1 years↑
"Dinosaur spells you cast cost less to cast."
less to cast."
Concordant Crossroads72%
$36.63↑#1469↑0.47↓32.4 years↑
"All creatures have haste."
Mass Hysteria72%
$2.30↓#3017↑0.19↓23.0 years↑
"All creatures have haste."
Samut, Voice of Dissent71%
$2.76↓#63570.06↓9.5 years↑
"Other creatures you control have haste."
Marauding Raptor71%
$0.85↓#3049↑0.19↓7.3 years↑
"Creature spells you cast cost less to cast."
less to cast."
Heartless Summoning71%
$1.63↓#2677↑0.37↓15.1 years↑
"Creature spells you cast cost less to cast."
less to cast."
Urza's Incubator71%
$20.34↑#311↑0.6227.4 years↑
"Creature spells of the chosen type cost less to cast."
less to cast."
Dragonlord's Servant71%
$0.19↓#1346↑0.21↓11.6 years↑
"Dragon spells you cast cost less to cast."
less to cast."