The Sibsig Ceremony 
Legendary Enchantment
$0.35 #8842 0.12 1.5 years
Creature spells you cast cost 
less to cast.
less to cast.Whenever a creature you control enters, if you cast it, destroy that creature, then create a 2/2 black Zombie Druid creature token.
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Cards similar to The Sibsig Ceremony 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.
Heartless Summoning98%
$1.63↑#2677↑0.37↑15.1 years↑
"Creature spells you cast cost less to cast."
less to cast."
Planar Gate91%
$74.69↑#21434↓0.38↑32.4 years↑
"Creature spells you cast cost less to cast."
less to cast."
Marauding Raptor89%
$0.85↑#3049↑0.197.3 years↑
"Creature spells you cast cost 
less to cast."
less to cast."
Honest Rutstein85%
$0.38↑#1855↑0.162.5 years
"Creature spells you cast cost less to cast."
less to cast."
Watcher of the Spheres84%
$0.63↑#4274↑0.036.3 years↑
"Creature spells with flying you cast cost less to cast."
less to cast."
Oketra's Monument80%
$3.33↑#1051↑0.209.5 years↑
"White creature spells you cast cost less to cast."
less to cast."+1 more matching line
Herald's Horn79%
$2.80↑#151↑0.24↑9.2 years↑
"Creature spells you cast of the chosen type cost less to cast."
less to cast."
Duskwatch Recruiter // Krallenhorde Howler78%
$0.32↓#5988↑0.2110.5 years↑
"Creature spells you cast cost less to cast."
less to cast."
Nylea, Keen-Eyed78%
$4.40↑#3608↑0.25↑6.7 years↑
"Creature spells you cast cost less to cast."
less to cast."
Warden of Evos Isle78%
$0.18↓#3779↑0.0413.3 years↑
"Creature spells with flying you cast cost less to cast."
less to cast."
Urza's Incubator78%
$20.34↑#311↑0.62↑27.4 years↑
"Creature spells of the chosen type cost less to cast."
less to cast."
Shadow in the Warp77%
$16.28↑#3603↑0.45↑4.0 years↑
"The first creature spell you cast each turn costs less to cast."
less to cast."
Baron Strucker, HYDRA Overlord76%
$0.20↓#78080.210.3 years↓
"Villain spells you cast cost less to cast."
less to cast."
Krosan Drover76%
$0.18↓#13981↓0.1523.4 years↑
"Creature spells you cast with mana value 6 or greater cost less to cast."
less to cast."
Radagast of Rhosgobel76%
$2.37↑#4221↑0.51↑0.2 years↓
"The first creature spell you cast each turn costs less to cast and can be cast as though it had flash."
less to cast and can be cast as though it had flash."
Rakdos, Lord of Riots76%
$0.68↑#2659↑0.41↑14.0 years↑
"Creature spells you cast cost less to cast for each 1 life your opponents have lost this turn."
less to cast for each 1 life your opponents have lost this turn."
Rhonas's Monument76%
$0.42↑#2126↑0.27↑9.5 years↑
"Green creature spells you cast cost less to cast."
less to cast."
Kefnet's Monument75%
$0.38↑#5045↑0.47↑9.5 years↑
"Blue creature spells you cast cost less to cast."
less to cast."
Blood Funnel75%
$2.29↑#15486↓0.31↑21.0 years↑
"Noncreature spells you cast cost less to cast."
less to cast."
Tombstone, Career Criminal74%
$0.21↓#6307↑0.00↓1.1 years
"Villain spells you cast cost less to cast."
less to cast."