Cockatrice 
Creature — Cockatrice
$0.33 #26397 0.00 33.1 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."
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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."
Tangle Asp94%
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"Whenever this creature blocks or becomes blocked by a 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."
Venom93%
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"Whenever enchanted creature blocks or becomes blocked by a non-Wall creature, destroy the other creature at end of combat."
Dread Specter90%
$0.20↓#307120.55↑29.9 years↓
"Whenever this creature blocks or becomes blocked by a nonblack creature, destroy that creature at end of combat."
Deathgazer90%
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"Whenever this creature blocks or becomes blocked by a nonblack creature, destroy that creature at end of combat."
Loyal Sentry90%
$0.17↓#20841↑0.53↑27.2 years↓
"When this creature blocks a creature, destroy that creature and this creature."
Sylvan Basilisk88%
$0.33#248150.27↑28.2 years↓
"Whenever this creature becomes blocked by a creature, destroy that creature."
Alaborn Zealot88%
$3.84↑#234370.33↑28.2 years↓
"When this creature blocks a creature, destroy both creatures."
Evil Eye of Urborg88%
$0.26↓#12026↑0.48↑19.9 years↓
"Whenever this creature becomes blocked by a creature, destroy that creature."
Kjeldoran Frostbeast86%
$0.28↓#306390.35↑31.3 years↓
"At end of combat, destroy all creatures blocking or blocked by this creature."
Gorgon Recluse86%
$0.13↓#12973↑0.0719.9 years↓
"Whenever this creature blocks or becomes blocked by a nonblack creature, destroy that creature at end of combat."
Abomination84%
$0.19↓#261640.11↑32.3 years
"Whenever this creature blocks or becomes blocked by a green or white creature, destroy that creature at end of combat."
Engulfing Slagwurm81%
$0.54↑#10179↑0.0015.9 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%
$0.03↓#312930.36↑22.9 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%
$0.10↓#250690.35↑32.5 years
"Whenever this creature becomes blocked by a Wall, destroy that Wall at end of combat."
Catacomb Dragon80%
$3.56↑#264340.31↑29.9 years↓
"Flying"