No Quarter 
Enchantment
$0.53 #25721 0.21 29.0 years
Whenever a creature becomes blocked by a creature with lesser power, destroy the blocking creature.
Whenever a creature blocks a creature with lesser power, destroy the attacking creature.
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Cards similar to No Quarter 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.
Dead-Iron Sledge84%
$0.23↓#19787↑0.43↑23.0 years↓
"Whenever equipped creature blocks or becomes blocked by a creature, destroy both creatures."
Searing Light82%
$0.07↓#258980.06↓10.7 years↓
"Destroy target attacking or blocking creature with power 2 or less."
Fight to the Death80%
$1.44↑#12921↑0.2517.5 years↓
"Destroy all blocking creatures and all blocked creatures."
Divine Verdict80%
$0.05↓#20435↑0.2017.3 years↓
"Destroy target attacking or blocking creature."
Neck Snap80%
$0.15↓#306970.1219.0 years↓
"Destroy target attacking or blocking creature."
Sylvan Basilisk80%
$0.31↓#252500.37↑28.3 years
"Whenever this creature becomes blocked by a creature, destroy that creature."
Evil Eye of Urborg79%
$0.26↓#12233↑0.1220.0 years↓
"Whenever this creature becomes blocked by a creature, destroy that creature."
Tide of War78%
$1.57↑#14253↑0.81↑22.1 years↓
"Whenever one or more creatures block, flip a coin. If you win the flip, each blocking creature is sacrificed by its controller. If you lose the flip, each blocked creature is sacrificed by its controller."
You Cannot Pass!76%
$0.26↓#10513↑0.00↓3.3 years↓
"Destroy target creature that blocked or was blocked by a legendary creature this turn."
Dwindle76%
$0.04↓#275020.00↓8.3 years↓
"When enchanted creature blocks, destroy it."
Venom76%
$0.11↓#252280.06↓32.2 years↑
"Whenever enchanted creature blocks or becomes blocked by a non-Wall creature, destroy the other creature at end of combat."
Puncturing Light74%
$0.05↓#270400.00↓16.5 years↓
"Destroy target attacking or blocking creature with power 3 or less."
Venomous Dragonfly74%
$0.16↓#284140.00↓27.0 years↓
"Whenever this creature blocks or becomes blocked by a creature, destroy that creature at end of combat."
Tangle Asp74%
$0.21↓#231340.2222.4 years↓
"Whenever this creature blocks or becomes blocked by a creature, destroy that creature at end of combat."
Barrow-Blade74%
$0.25↓#7215↑0.31↑3.3 years↓
"Whenever equipped creature blocks or becomes blocked by a creature, that creature loses all abilities until end of turn."
Ogre Leadfoot74%
$0.04↓#31638↓0.06↓23.0 years↓
"Whenever this creature becomes blocked by an artifact creature, destroy that creature."
Sudden Strike74%
$0.20↓#10222↑0.45↑1.1 years↓
"Destroy target attacking or blocking creature."
Vanquish74%
$0.10↓#304500.07↓22.4 years↓
"Destroy target blocking creature."
Heat Stroke74%
$4.75↑#17889↑0.80↑29.4 years
"At end of combat, destroy each creature that blocked or was blocked this turn."
Rust Scarab74%
$0.19↓#212240.07↓13.7 years↓
"Whenever this creature becomes blocked, you may destroy target artifact or enchantment defending player controls."