Drekavac 
Creature — Beast
$0.27 #30994 0.21 20.3 years
When this creature enters, sacrifice it unless you discard a noncreature card.
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Cards similar to Drekavac 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 Brawler90%
$0.19↓#19358↑0.219.4 years↓
"When this creature enters, discard a card."
Avatar of Discord88%
$0.33↑#249390.00↓20.4 years
"When this creature enters, sacrifice it unless you discard two cards."
Rotting Regisaur83%
$1.73↑#5151↑0.137.2 years↓
"At the beginning of your upkeep, discard a card."
Balduvian Horde80%
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"When this creature enters, sacrifice it unless you discard a card at random."
Pillaging Horde80%
$0.11↓#308090.64↑29.3 years↑
"When this creature enters, sacrifice it unless you discard a card at random."
Minotaur Explorer80%
$0.27#302390.40↑24.9 years↑
"When this creature enters, sacrifice it unless you discard a card at random."
Mercenary Knight78%
$3.39↑#303040.47↑29.3 years↑
"When this creature enters, sacrifice it unless you discard a creature card."
Razormane Masticore78%
$0.28↑#271730.00↓22.3 years↑
"At the beginning of your upkeep, sacrifice this creature unless you discard a card."
Pale Rider of Trostad76%
$0.09↓#261620.07↓10.4 years↓
"When this creature enters, discard a card."
Heightened Awareness76%
$0.26↓#268080.1526.3 years↑
"As this enchantment enters, discard your hand."
Thundering Wurm74%
$1.71↑#309530.42↑29.3 years↑
"When this creature enters, sacrifice it unless you discard a land card."
Fallow Wurm74%
$0.24↓#303920.53↑29.2 years↑
"When this creature enters, sacrifice it unless you discard a land card."
Hidden Horror73%
$0.18↓#291570.2529.2 years↑
"When this creature enters, sacrifice it unless you discard a creature card."
Masticore72%
$19.71↑#249920.57↑27.2 years↑
"At the beginning of your upkeep, sacrifice this creature unless you discard a card."
Mardu Outrider72%
$0.24↓#258420.00↓6.1 years↓
"As an additional cost to cast this spell, discard a card."
Molten-Tail Masticore71%
$0.35↑#295580.73↑15.9 years↓
"At the beginning of your upkeep, sacrifice this creature unless you discard a card."