Deathgazer 
Creature — Lizard
$0.07 #27105 0.09 27.0 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%
$0.19↑#309650.1830.0 years↑
"Whenever this creature blocks or becomes blocked by a nonblack creature, destroy that creature at end of combat."
Gorgon Recluse96%
$0.12↑#13215↑0.1220.0 years↓
"Whenever this creature blocks or becomes blocked by a nonblack creature, destroy that creature at end of combat."
Venomous Dragonfly96%
$0.16↑#284140.0027.0 years
"Whenever this creature blocks or becomes blocked by a creature, destroy that creature at end of combat."
Tangle Asp96%
$0.21↑#231340.22↑22.4 years↓
"Whenever this creature blocks or becomes blocked by a creature, destroy that creature at end of combat."
Thicket Basilisk93%
$0.13↑#287360.1133.2 years↑
"Whenever this creature blocks or becomes blocked by a non-Wall creature, destroy that creature at end of combat."
Infernal Medusa92%
$6.11↑#274470.24↑32.4 years↑
"Whenever this creature blocks a creature, destroy that creature at end of combat."
Loyal Sentry92%
$0.19↑#21009↑0.0527.3 years
"When this creature blocks a creature, destroy that creature and this creature."
Sylvan Basilisk92%
$0.31↑#252500.37↑28.3 years↑
"Whenever this creature becomes blocked by a creature, destroy that creature."
Evil Eye of Urborg91%
$0.26↑#12233↑0.1220.0 years↓
"Whenever this creature becomes blocked by a creature, destroy that creature."
Rock Basilisk90%
$0.62↑#315930.21↑30.0 years↑
"Whenever this creature blocks or becomes blocked by a non-Wall creature, destroy that creature at end of combat."
Cockatrice90%
$0.33↑#265730.0033.2 years↑
"Whenever this creature blocks or becomes blocked by a non-Wall creature, destroy that creature at end of combat."
Alaborn Zealot90%
$3.99↑#235240.1128.3 years↑
"When this creature blocks a creature, destroy both creatures."
Kjeldoran Frostbeast90%
$0.25↑#309140.29↑31.4 years↑
"At end of combat, destroy all creatures blocking or blocked by this creature."
Abomination88%
$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."
Ogre Leadfoot86%
$0.04↓#316380.0623.0 years↓
"Whenever this creature becomes blocked by an artifact creature, destroy that creature."
Venom84%
$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."
Dead-Iron Sledge84%
$0.23↑#19787↑0.43↑23.0 years↓
"Whenever equipped creature blocks or becomes blocked by a creature, destroy both creatures."
Engulfing Slagwurm84%
$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."
Phyrexian Slayer83%
$0.11↑#306440.1226.0 years
"Whenever this creature becomes blocked by a white creature, destroy that creature. It can't be regenerated."
Phyrexian Reaper83%
$0.11↑#306530.0926.0 years
"Whenever this creature becomes blocked by a green creature, destroy that creature. It can't be regenerated."