Rotting Regisaur 
Creature — Zombie Dinosaur
$1.73 #5151 0.13 7.2 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.
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"When this creature enters, discard a card."
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"Cumulative upkeep—Discard a card."
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$0.28↓#27173↓0.00↓22.3 years↑
"At the beginning of your upkeep, sacrifice this creature unless you discard a card."
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"When this creature enters, sacrifice it unless you discard a noncreature card."
Avatar of Discord82%
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"When this creature enters, sacrifice it unless you discard two cards."
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"When this creature enters, discard a card."
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"As this enchantment enters, discard your hand."
Masticore78%
$19.71↑#24992↓0.57↑27.2 years↑
"At the beginning of your upkeep, sacrifice this creature unless you discard a card."
Mishra's War Machine78%
$0.41↓#26014↓0.25↑32.5 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."
Duplicity77%
$0.33↓#31383↓0.29↑28.9 years↑
"At the beginning of your end step, discard a card."
Rakdos Headliner77%
$0.11↓#22771↓0.075.2 years↓
"Echo—Discard a card."
Mardu Outrider77%
$0.24↓#25842↓0.00↓6.1 years↓
"As an additional cost to cast this spell, discard a card."
Grafted Skullcap76%
$3.93↑#16469↓0.37↑27.9 years↑
"At the beginning of your end step, discard your hand."
Avaricious Dragon76%
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"At the beginning of your end step, discard your hand."
Molten-Tail Masticore76%
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"At the beginning of your upkeep, sacrifice this creature unless you discard a card."
Deepcavern Imp76%
$0.06↓#28734↓0.29↑19.3 years↑
"Echo—Discard a card."
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"At the beginning of each player's upkeep, that player discards a card."
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"At the beginning of your upkeep, discard a card if you don't control an Ogre."
Balduvian Horde74%
$0.04↓#28793↓0.00↓30.2 years↑
"When this creature enters, sacrifice it unless you discard a card at random."