Dead-Iron Sledge 
Artifact — Equipment
$0.25 #19729 0.33 22.9 years
Whenever equipped creature blocks or becomes blocked by a creature, destroy both creatures.
Equip 
(: Attach to target creature you control. Equip only as a sorcery.)
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Cards similar to Dead-Iron Sledge 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.
Sylvan Basilisk92%
$0.33↑#24815↓0.2728.2 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."
Alaborn Zealot88%
$3.84↑#234370.3328.2 years↑
"When this creature blocks a creature, destroy both creatures."
Tangle Asp87%
$0.16↓#228360.58↑22.3 years
"Whenever this creature blocks or becomes blocked by a creature, destroy that creature at end of combat."
Venom87%
$0.10↓#24922↓0.3332.1 years↑
"Whenever enchanted creature blocks or becomes blocked by a non-Wall creature, destroy the other creature at end of combat."
Ogre Leadfoot86%
$0.03↓#31293↓0.3622.9 years
"Whenever this creature becomes blocked by an artifact creature, destroy that creature."
Venomous Dragonfly86%
$0.16↓#27986↓0.00↓26.9 years↑
"Whenever this creature blocks or becomes blocked by a creature, destroy that creature at end of combat."
Loyal Sentry86%
$0.17↓#208410.53↑27.2 years↑
"When this creature blocks a creature, destroy that creature and this creature."
Mirror Shield86%
$0.60↑#5197↑0.14↓6.6 years↓
"Equipped creature gets +0/+2 and has hexproof and "Whenever a creature with deathtouch blocks or becomes blocked by this creature, destroy that creature.""
+1 more matching line
Heat Stroke86%
$4.67↑#175550.94↑29.2 years↑
"At end of combat, destroy each creature that blocked or was blocked this turn."
Barrow-Blade84%
$0.27↑#7215↑0.303.2 years↓
"Whenever equipped creature blocks or becomes blocked by a creature, that creature loses all abilities until end of turn."
+1 more matching line
Dread Specter84%
$0.20↓#30712↓0.55↑29.9 years↑
"Whenever this creature blocks or becomes blocked by a nonblack creature, destroy that creature at end of combat."
Deathgazer84%
$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."
No Quarter84%
$0.51↑#25359↓0.44↑28.9 years↑
"Whenever a creature becomes blocked by a creature with lesser power, destroy the blocking creature."
Wooden Stake84%
$0.08↓#28252↓0.14↓14.9 years↓
"Whenever equipped creature blocks or becomes blocked by a Vampire, destroy that creature. It can't be regenerated."
+1 more matching line
Thicket Basilisk84%
$0.14↓#28384↓0.19↓33.1 years↑
"Whenever this creature blocks or becomes blocked by a non-Wall creature, destroy that creature at end of combat."
Fight to the Death82%
$1.15↑#12950↑0.21↓17.3 years↓
"Destroy all blocking creatures and all blocked creatures."
Cockatrice80%
$0.33↑#26397↓0.00↓33.1 years↑
"Whenever this creature blocks or becomes blocked by a non-Wall creature, destroy that creature at end of combat."
Rock Basilisk80%
$0.63↑#31284↓0.00↓29.9 years↑
"Whenever this creature blocks or becomes blocked by a non-Wall creature, destroy that creature at end of combat."
Phyrexian Reaper80%
$0.10↓#30421↓1.41↑25.9 years↑
"Whenever this creature becomes blocked by a green creature, destroy that creature. It can't be regenerated."