Deathgazer 
Creature — Lizard
$0.07 #26710 0.00 26.9 years
Whenever this creature blocks or becomes blocked by a nonblack creature, destroy that creature at end of combat.
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Cards similar to Deathgazer 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.
Dread Specter100%
$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."
Gorgon Recluse96%
$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."
Tangle Asp96%
$0.16↑#228360.58↑22.3 years↓
"Whenever this creature blocks or becomes blocked by a creature, destroy that creature at end of combat."
Venomous Dragonfly96%
$0.16↑#279860.0026.9 years
"Whenever this creature blocks or becomes blocked by a creature, destroy that creature at end of combat."
Thicket Basilisk93%
$0.14↑#283840.19↑33.1 years↑
"Whenever this creature blocks or becomes blocked by a non-Wall creature, destroy that creature at end of combat."
Infernal Medusa92%
$5.89↑#271990.0632.3 years↑
"Whenever this creature blocks a creature, destroy that creature at end of combat."
Loyal Sentry92%
$0.17↑#20841↑0.53↑27.2 years
"When this creature blocks a creature, destroy that creature and this creature."
Sylvan Basilisk92%
$0.33↑#248150.27↑28.2 years↑
"Whenever this creature becomes blocked by a creature, destroy that creature."
Evil Eye of Urborg91%
$0.26↑#12026↑0.48↑19.9 years↓
"Whenever this creature becomes blocked by a creature, destroy that creature."
Cockatrice90%
$0.33↑#263970.0033.1 years↑
"Whenever this creature blocks or becomes blocked by a non-Wall creature, destroy that creature at end of combat."
Rock Basilisk90%
$0.63↑#312840.0029.9 years↑
"Whenever this creature blocks or becomes blocked by a non-Wall creature, destroy that creature at end of combat."
Alaborn Zealot90%
$3.84↑#234370.33↑28.2 years↑
"When this creature blocks a creature, destroy both creatures."
Kjeldoran Frostbeast90%
$0.28↑#306390.35↑31.3 years↑
"At end of combat, destroy all creatures blocking or blocked by this creature."
Abomination88%
$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."
Ogre Leadfoot86%
$0.03↓#312930.36↑22.9 years↓
"Whenever this creature becomes blocked by an artifact creature, destroy that creature."
Venom84%
$0.10↑#249220.33↑32.1 years↑
"Whenever enchanted creature blocks or becomes blocked by a non-Wall creature, destroy the other creature at end of combat."
Dead-Iron Sledge84%
$0.25↑#19729↑0.33↑22.9 years↓
"Whenever equipped creature blocks or becomes blocked by a creature, destroy both creatures."
Engulfing Slagwurm84%
$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."
Phyrexian Slayer83%
$0.10↑#303110.0025.9 years
"Whenever this creature becomes blocked by a white creature, destroy that creature. It can't be regenerated."
Phyrexian Reaper83%
$0.10↑#304211.41↑25.9 years
"Whenever this creature becomes blocked by a green creature, destroy that creature. It can't be regenerated."