Mercenary Knight 
Creature — Human Mercenary Knight
$3.39 #30304 0.47 29.3 years
When this creature enters, sacrifice it unless you discard a creature card.
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Cards similar to Mercenary Knight 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.
Hidden Horror94%
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"When this creature enters, sacrifice it unless you discard a creature card."
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"When this creature enters, discard any number of creature cards. For each card discarded this way, put two +1/+1 counters on this creature."
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"When this creature enters, exile it unless you discard a creature card."
Crypt Lurker84%
$0.10↓#23882↑0.27↓6.2 years↓
"When this creature enters, you may sacrifice a creature or discard a creature card. If you do, draw a card."
Drekavac78%
$0.27↓#309940.21↓20.3 years↓
"When this creature enters, sacrifice it unless you discard a noncreature card."
Selhoff Entomber76%
$0.21↓#17877↑0.07↓4.8 years↓
"
, Discard a creature card: Draw a card."
, Discard a creature card: Draw a card."
Bloodrage Brawler75%
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"When this creature enters, discard a card."
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"Discard a creature card: Put a +1/+1 counter on this creature."
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$0.26↓#314680.27↓25.6 years↓
"Kicker—, Discard a creature card."
, Discard a creature card."
Aether Tide72%
$0.10↓#268480.05↓28.2 years↓
"As an additional cost to cast this spell, discard X creature cards."
Rotting Regisaur70%
$1.73↓#5151↑0.13↓7.2 years↓
"At the beginning of your upkeep, discard a card."