Kadena, Slinking Sorcerer 
Legendary Creature — Snake Wizard Sorcerer
$0.44 #12555 0.22 7.2 years
The first face-down creature spell you cast each turn costs 
less to cast.
less to cast.Whenever a face-down creature you control enters, draw a card.
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Cards similar to Kadena, Slinking Sorcerer 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.
Dream Chisel94%
$4.56↑#139310.00↓24.0 years↑
"Face-down creature spells you cast cost less to cast."
less to cast."
They Came from the Pipes90%
$0.33↓#5779↑0.00↓2.1 years↓
"Whenever a face-down creature you control enters, draw a card."
Obscuring Aether88%
$0.19↓#115910.00↓11.6 years↑
"Face-down creature spells you cast cost less to cast."
less to cast."
Goblin Maskmaker86%
$0.04↓#21912↓0.05↓2.7 years↓
"Whenever this creature attacks, face-down spells you cast this turn cost less to cast."
less to cast."
Panoptic Projektor84%
$0.31↓#9442↑0.06↓2.7 years↓
"
: The next face-down creature spell you cast this turn costs less to cast."
: The next face-down creature spell you cast this turn costs less to cast."
Soul of the Harvest76%
$1.65↑#1652↑0.2514.5 years↑
"Whenever another nontoken creature you control enters, you may draw a card."
Secret Plans76%
$0.21↓#9200↑0.06↓12.1 years↑
"Whenever a permanent you control is turned face up, draw a card."
+1 more matching line
The Blue Spirit74%
$1.31↑#7298↑0.33↑0.9 years↓
"Whenever a nontoken creature you control enters during combat, draw a card."
Oblivious Bookworm74%
$0.18↓#131060.00↓2.1 years↓
"At the beginning of your end step, you may draw a card. If you do, discard a card unless a permanent entered the battlefield face down under your control this turn or you turned a permanent face up this turn."
Kaust, Eyes of the Glade73%
$0.20↓#17276↓0.292.7 years↓
"Whenever a creature you control that was turned face up this turn deals combat damage to a player, draw a card."
+1 more matching line
Yarus, Roar of the Old Gods72%
$0.17↓#122480.212.7 years↓
"Whenever one or more face-down creatures you control deal combat damage to a player, draw a card."
Tocasia's Welcome72%
$1.40↑#817↑0.163.9 years↓
"Whenever one or more creatures you control with mana value 3 or less enter, draw a card. This ability triggers only once each turn."
Huatli, Radiant Champion71%
$4.01↑#9602↑0.138.8 years↑
"−8: You get an emblem with "Whenever a creature you control enters, you may draw a card.""
Aphetto Runecaster71%
$0.35↓#16479↓0.00↓23.4 years↑
"Whenever a permanent is turned face up, you may draw a card."
Tunnel Tipster71%
$0.18↓#15954↓0.00↓2.7 years↓
"At the beginning of your end step, if a face-down creature entered the battlefield under your control this turn, put a +1/+1 counter on this creature."
Gladewalker Ritualist70%
$0.25↓#20901↓0.07↓5.7 years↓
"Whenever another creature you control named this card enters, draw a card."