Herald of Slaanesh 
Creature — Demon
$5.82 #5781 0.19 3.9 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.
Goblin Warchief78%
$0.89↓#2080↑0.2823.3 years↑
"Goblins you control have haste."
+1 more matching line
Planar Gate78%
$77.60↑#21320↓0.68↑32.3 years↑
"Creature spells you cast cost less to cast."
less to cast."
Ancient Cellarspawn77%
$6.16↑#2452↑0.35↑1.9 years↓
"Each spell you cast that's a Demon, Horror, or Nightmare costs 
less to cast."
less to cast."
Emblem of the Warmind77%
$0.47↓#14717↓0.2519.3 years↑
"Creatures you control have haste."
Fervor77%
$2.22↓#3513↑0.30↑29.2 years↑
"Creatures you control have haste."
Cyclops of Eternal Fury77%
$0.20↓#16262↓0.1712.3 years↑
"Creatures you control have haste."
Madrush Cyclops77%
$0.37↓#23094↓0.1817.3 years↑
"Creatures you control have haste."
Tuktuk Rubblefort76%
$0.22↓#7925↓0.295.9 years↑
"Creatures you control have haste."
Fires of Yavimaya75%
$0.31↓#3258↑0.1725.9 years↑
"Creatures you control have haste."
Starnheim Aspirant74%
$9.02↑#3150↑0.255.6 years↑
"Angel spells you cast cost less to cast."
less to cast."
Honest Rutstein72%
$0.39↓#1787↑0.192.4 years↓
"Creature spells you cast cost less to cast."
less to cast."
Otepec Huntmaster72%
$0.37↓#3099↑0.218.9 years↑
"Dinosaur spells you cast cost less to cast."
less to cast."
Krosan Warchief72%
$0.33↓#11040↓0.53↑23.3 years↑
"Beast spells you cast cost less to cast."
less to cast."
Mass Hysteria72%
$2.54↓#3086↑0.34↑22.9 years↑
"All creatures have haste."
Concordant Crossroads72%
$32.91↑#1474↑0.45↑32.3 years↑
"All creatures have haste."
Samut, Voice of Dissent71%
$2.77↓#62640.00↓9.4 years↑
"Other creatures you control have haste."
Marauding Raptor71%
$0.91↓#3000↑0.187.2 years↑
"Creature spells you cast cost less to cast."
less to cast."
Heartless Summoning71%
$1.42↓#2793↑0.2514.9 years↑
"Creature spells you cast cost less to cast."
less to cast."
Urza's Incubator71%
$18.41↑#316↑0.52↑27.2 years↑
"Creature spells of the chosen type cost less to cast."
less to cast."
Dragonlord's Servant71%
$0.28↓#1344↑0.2211.4 years↑
"Dragon spells you cast cost less to cast."
less to cast."