Cockatrice 
Creature — Cockatrice
$0.33 #26573 0.00 33.2 years
Flying
Whenever this creature blocks or becomes blocked by a non-Wall creature, destroy that creature at end of combat.
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Cards similar to Cockatrice 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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"Whenever this creature blocks or becomes blocked by a non-Wall creature, destroy that creature at end of combat."
Infernal Medusa98%
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"Whenever this creature becomes blocked by a non-Wall creature, destroy that creature at end of combat."
Thicket Basilisk98%
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"Whenever this creature blocks or becomes blocked by a non-Wall creature, destroy that creature at end of combat."
Venomous Dragonfly94%
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"Whenever this creature blocks or becomes blocked by a creature, destroy that creature at end of combat."
Tangle Asp94%
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"Whenever this creature blocks or becomes blocked by a creature, destroy that creature at end of combat."
Venom93%
$0.11↓#252280.0632.2 years
"Whenever enchanted creature blocks or becomes blocked by a non-Wall creature, destroy the other creature at end of combat."
Deathgazer90%
$0.07↓#271050.0927.0 years↓
"Whenever this creature blocks or becomes blocked by a nonblack creature, destroy that creature at end of combat."
Dread Specter90%
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"Whenever this creature blocks or becomes blocked by a nonblack creature, destroy that creature at end of combat."
Loyal Sentry90%
$0.19↓#21009↑0.0527.3 years↓
"When this creature blocks a creature, destroy that creature and this creature."
Sylvan Basilisk88%
$0.31↓#252500.37↑28.3 years↓
"Whenever this creature becomes blocked by a creature, destroy that creature."
Alaborn Zealot88%
$3.99↑#235240.11↑28.3 years↓
"When this creature blocks a creature, destroy both creatures."
Evil Eye of Urborg88%
$0.26↓#12233↑0.12↑20.0 years↓
"Whenever this creature becomes blocked by a creature, destroy that creature."
Kjeldoran Frostbeast86%
$0.25↓#309140.29↑31.4 years↓
"At end of combat, destroy all creatures blocking or blocked by this creature."
Gorgon Recluse85%
$0.12↓#13215↑0.12↑20.0 years↓
"Whenever this creature blocks or becomes blocked by a nonblack creature, destroy that creature at end of combat."
Abomination84%
$0.19↓#262780.20↑32.4 years
"Whenever this creature blocks or becomes blocked by a green or white creature, destroy that creature at end of combat."
Engulfing Slagwurm81%
$0.57↑#10411↑0.41↑16.1 years↓
"Whenever this creature blocks or becomes blocked by a creature, destroy that creature. You gain life equal to that creature's toughness."
Ogre Leadfoot80%
$0.04↓#316380.0623.0 years↓
"Whenever this creature becomes blocked by an artifact creature, destroy that creature."
Dead-Iron Sledge80%
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"Whenever equipped creature blocks or becomes blocked by a creature, destroy both creatures."
Battering Ram80%
$0.09↓#253630.12↑32.6 years
"Whenever this creature becomes blocked by a Wall, destroy that Wall at end of combat."
Zombie Boa80%
$0.12↓#297210.30↑25.4 years↓
"
: Choose a color. Whenever this creature becomes blocked by a creature of that color this turn, destroy that creature. Activate only as a sorcery."
: Choose a color. Whenever this creature becomes blocked by a creature of that color this turn, destroy that creature. Activate only as a sorcery."