Rotting Regisaur 
Creature — Zombie Dinosaur
$2.08 #5066 0.27 7.3 years
At the beginning of your upkeep, discard a card.
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Cards similar to Rotting Regisaur 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.
Bloodrage Brawler92%
$0.21↓#19675↓0.00↓9.5 years↑
"When this creature enters, discard a card."
Vexing Sphinx84%
$0.18↓#20601↓0.11↓20.2 years↑
"Cumulative upkeep—Discard a card."
Furyblade Vampire84%
$0.11↓#20602↓0.00↓10.2 years↑
"At the beginning of combat on your turn, you may discard a card. If you do, this creature gets +3/+0 until end of turn."
Razormane Masticore83%
$0.25↓#27436↓0.00↓22.4 years↑
"At the beginning of your upkeep, sacrifice this creature unless you discard a card."
Drekavac83%
$0.22↓#31408↓0.00↓20.5 years↑
"When this creature enters, sacrifice it unless you discard a noncreature card."
Avatar of Discord82%
$0.28↓#25346↓0.00↓20.5 years↑
"When this creature enters, sacrifice it unless you discard two cards."
Pale Rider of Trostad79%
$0.09↓#26431↓0.00↓10.5 years↑
"When this creature enters, discard a card."
Heightened Awareness78%
$0.30↓#27143↓0.05↓26.4 years↑
"As this enchantment enters, discard your hand."
Masticore78%
$16.74↑#25312↓0.00↓27.4 years↑
"At the beginning of your upkeep, sacrifice this creature unless you discard a card."
Mishra's War Machine78%
$0.40↓#25935↓0.06↓32.6 years↑
"At the beginning of your upkeep, this creature deals 3 damage to you unless you discard a card. If it deals damage to you this way, tap it."
Exiled Boggart78%
$0.19↓#30902↓0.06↓19.0 years↑
"When this creature dies, discard a card."
Duplicity77%
$0.37↓#31641↓0.41↑29.0 years↑
"At the beginning of your end step, discard a card."
Rakdos Headliner77%
$0.09↓#23186↓0.06↓5.3 years↓
"Echo—Discard a card."
Avaricious Dragon76%
$2.52↑#11265↓0.00↓11.3 years↑
"At the beginning of your end step, discard your hand."
Grafted Skullcap76%
$4.61↑#16623↓0.00↓28.0 years↑
"At the beginning of your end step, discard your hand."
Molten-Tail Masticore76%
$0.41↓#29903↓0.16↓16.1 years↑
"At the beginning of your upkeep, sacrifice this creature unless you discard a card."
Deepcavern Imp76%
$0.03↓#28870↓0.07↓19.5 years↑
"Echo—Discard a card."
Mardu Outrider76%
$0.19↓#26006↓0.186.2 years↓
"As an additional cost to cast this spell, discard a card."
Minotaur Explorer75%
$0.24↓#30534↓0.2425.1 years↑
"When this creature enters, sacrifice it unless you discard a card at random."
Balduvian Horde75%
$0.04↓#29022↓0.00↓30.4 years↑
"When this creature enters, sacrifice it unless you discard a card at random."