Carnival Hellsteed 
Creature — Nightmare Horse
$0.16 #24225 0.07 14.0 years
First strike, haste
Unleash (You may have this creature enter with a +1/+1 counter on it. It can't block as long as it has a +1/+1 counter on it.)
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Cards similar to Carnival Hellsteed 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.
Splatter Thug100%
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+1 more matching line
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Thrill-Kill Assassin100%
$0.13↓#17119↑0.0014.0 years
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"Unleash"
Rakdos Cackler100%
$0.19↑#198880.0014.0 years
"Unleash"
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$0.10↓#248880.0014.0 years
"Unleash"
Dead Reveler100%
$0.03↓#287610.0014.0 years
"Unleash"
Rakdos Drake100%
$0.06↓#265420.0013.5 years
"Unleash"
Grim Roustabout96%
$0.18↑#238570.0014.0 years
"Unleash"
Exava, Rakdos Blood Witch96%
$0.22↑#17530↑0.0613.5 years
"Unleash"
+1 more matching line
Chaos Imps94%
$0.26↑#234540.0714.0 years
"Unleash"
Craven Hulk88%
$0.03↓#29908↓0.005.7 years↓
"This creature can't block alone."
Hellhole Flailer86%
$0.05↓#249230.0014.0 years
"Unleash"
Mogg Flunkies80%
$0.05↓#224620.0028.6 years↑
"This creature can't attack or block alone."
Ember Beast80%
$0.02↓#30343↓0.21↑25.1 years↑
"This creature can't attack or block alone."
Jackal Familiar80%
$0.09↓#30159↓0.0017.3 years↑
"This creature can't attack or block alone."
Bonded Horncrest80%
$0.14↓#275520.20↑9.1 years↓
"This creature can't attack or block alone."
Loyal Pegasus80%
$0.17↑#194780.0012.7 years↓
"This creature can't attack or block alone."
Wirecat79%
$0.19↑#32018↓0.0028.0 years↑
"This creature can't attack or block if an enchantment is on the battlefield."
Shivan Raptor76%
$0.08↓#31325↓0.0028.0 years↑
"First strike, haste"