Infinite Authority 
Enchantment — Aura
$12.91 #30509 0.36 32.4 years
Enchant creature
Whenever enchanted creature blocks or becomes blocked by a creature with toughness 3 or less, destroy the other creature at end of combat. At the beginning of the next end step, if that creature was destroyed this way, put a +1/+1 counter on the first creature.
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Venom86%
$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."
+1 more matching line
Venomous Breath85%
$0.20↓#287990.06↓31.4 years↓
"Choose target creature. At this turn's next end of combat, destroy all creatures that blocked or were blocked by it this turn."
Ferocity82%
$0.19↓#24385↑0.06↓27.0 years↓
"Whenever enchanted creature blocks or becomes blocked, you may put a +1/+1 counter on it."
Tangle Asp81%
$0.21↓#23134↑0.22↓22.4 years↓
"Whenever this creature blocks or becomes blocked by a creature, destroy that creature at end of combat."
Venomous Dragonfly80%
$0.16↓#284140.00↓27.0 years↓
"Whenever this creature blocks or becomes blocked by a creature, destroy that creature at end of combat."
Dead-Iron Sledge80%
$0.23↓#19787↑0.4323.0 years↓
"Whenever equipped creature blocks or becomes blocked by a creature, destroy both creatures."
Heat Stroke79%
$4.75↓#17889↑0.80↑29.4 years↓
"At end of combat, destroy each creature that blocked or was blocked this turn."
Infernal Medusa78%
$6.11↓#274470.24↓32.4 years
"Whenever this creature blocks a creature, destroy that creature at end of combat."
Thicket Basilisk78%
$0.13↓#287360.11↓33.2 years
"Whenever this creature blocks or becomes blocked by a non-Wall creature, destroy that creature at end of combat."
Deathgazer77%
$0.07↓#271050.09↓27.0 years↓
"Whenever this creature blocks or becomes blocked by a nonblack creature, destroy that creature at end of combat."
Dread Specter77%
$0.19↓#309650.18↓30.0 years↓
"Whenever this creature blocks or becomes blocked by a nonblack creature, destroy that creature at end of combat."
Glyph of Doom76%
$0.36↓#293150.00↓32.4 years
"Choose target Wall creature. At this turn's next end of combat, destroy all creatures that were blocked by that creature this turn."
Gaze of the Gorgon76%
$0.11↓#247300.59↑21.0 years↓
"Regenerate target creature. At this turn's next end of combat, destroy all creatures that blocked or were blocked by it this turn."
Sylvan Basilisk76%
$0.31↓#252500.3728.3 years↓
"Whenever this creature becomes blocked by a creature, destroy that creature."
Contaminated Bond76%
$0.11↓#20001↑0.12↓23.0 years↓
"Enchant creature"
Evil Eye of Urborg76%
$0.26↓#12233↑0.12↓20.0 years↓
"Whenever this creature becomes blocked by a creature, destroy that creature."
Rock Basilisk74%
$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."
Cockatrice74%
$0.33↓#265730.00↓33.2 years
"Whenever this creature blocks or becomes blocked by a non-Wall creature, destroy that creature at end of combat."
Kjeldoran Frostbeast74%
$0.25↓#309140.2931.4 years↓
"At end of combat, destroy all creatures blocking or blocked by this creature."
Iona's Blessing74%
$0.12↓#19644↑0.06↓10.7 years↓
"Enchant creature"