Carnival Hellsteed 
Creature — Nightmare Horse
$0.12 #23892 0.21 13.9 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.
Rakdos Cackler100%
$0.17↑#195430.05↓13.9 years
"Unleash"
Spawn of Rix Maadi100%
$0.10↓#28762↓0.2513.9 years
"Unleash"
Bloodfray Giant100%
$0.08↓#245620.32↑13.9 years
"Unleash"
Thrill-Kill Assassin100%
$0.13↑#16706↑0.2513.9 years
"Unleash"
Gore-House Chainwalker100%
$0.03↓#273310.50↑13.9 years
"Unleash"
Dead Reveler100%
$0.07↓#284230.2213.9 years
"Unleash"
Splatter Thug100%
$0.05↓#263230.2413.9 years
"Unleash"
+1 more matching line
Rakdos Drake100%
$0.06↓#262230.2113.3 years
"Unleash"
Grim Roustabout96%
$0.14↑#234820.06↓13.9 years
"Unleash"
Exava, Rakdos Blood Witch96%
$0.23↑#17213↑0.1113.3 years
"Unleash"
+1 more matching line
Chaos Imps94%
$0.25↑#230490.1313.9 years
"Unleash"
Craven Hulk88%
$0.06↓#29435↓0.00↓5.6 years↓
"This creature can't block alone."
Hellhole Flailer86%
$0.04↓#246420.1913.9 years
"Unleash"
Jackal Familiar80%
$0.13↑#29760↓0.69↑17.1 years↑
"This creature can't attack or block alone."
Ember Beast80%
$0.03↓#30048↓0.00↓24.9 years↑
"This creature can't attack or block alone."
Bonded Horncrest80%
$0.12#271970.188.9 years↓
"This creature can't attack or block alone."
Mogg Flunkies80%
$0.04↓#221810.2928.5 years↑
"This creature can't attack or block alone."
Loyal Pegasus80%
$0.20↑#193850.00↓12.6 years↓
"This creature can't attack or block alone."
Wirecat78%
$0.21↑#31698↓0.2227.9 years↑
"This creature can't attack or block if an enchantment is on the battlefield."
Shivan Raptor76%
$0.10↓#30997↓0.2927.9 years↑
"First strike, haste"