Infinite Authority 
Enchantment — Aura
$11.94 #30323 0.29 32.3 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%
$0.10↓#249220.3332.1 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↓#283780.06↓31.3 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%
$0.23↓#24150↑0.3126.9 years↓
"Whenever enchanted creature blocks or becomes blocked, you may put a +1/+1 counter on it."
Tangle Asp81%
$0.16↓#22836↑0.58↑22.3 years↓
"Whenever this creature blocks or becomes blocked by a creature, destroy that creature at end of combat."
Venomous Dragonfly80%
$0.16↓#279860.00↓26.9 years↓
"Whenever this creature blocks or becomes blocked by a creature, destroy that creature at end of combat."
Dead-Iron Sledge80%
$0.25↓#19729↑0.3322.9 years↓
"Whenever equipped creature blocks or becomes blocked by a creature, destroy both creatures."
Heat Stroke79%
$4.67↓#17555↑0.94↑29.2 years↓
"At end of combat, destroy each creature that blocked or was blocked this turn."
Infernal Medusa78%
$5.89↓#271990.06↓32.3 years
"Whenever this creature blocks a creature, destroy that creature at end of combat."
Thicket Basilisk78%
$0.14↓#283840.1933.1 years
"Whenever this creature blocks or becomes blocked by a non-Wall creature, destroy that creature at end of combat."
Forced Adaptation78%
$0.17↓#8317↑0.50↑13.6 years↓
"Enchant creature"
Dread Specter77%
$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."
Deathgazer77%
$0.07↓#267100.00↓26.9 years↓
"Whenever this creature blocks or becomes blocked by a nonblack creature, destroy that creature at end of combat."
Glyph of Doom76%
$0.34↓#290460.2332.3 years
"Choose target Wall creature. At this turn's next end of combat, destroy all creatures that were blocked by that creature this turn."
Sylvan Basilisk76%
$0.33↓#248150.2728.2 years↓
"Whenever this creature becomes blocked by a creature, destroy that creature."
Contaminated Bond76%
$0.10↓#19718↑0.12↓22.9 years↓
"Enchant creature"
Gaze of the Gorgon76%
$0.12↓#244650.41↑20.9 years↓
"Regenerate target creature. At this turn's next end of combat, destroy all creatures that blocked or were blocked by it this turn."
Evil Eye of Urborg76%
$0.26↓#12026↑0.48↑19.9 years↓
"Whenever this creature becomes blocked by a creature, destroy that creature."
Cockatrice74%
$0.33↓#263970.00↓33.1 years
"Whenever this creature blocks or becomes blocked by a non-Wall creature, destroy that creature at end of combat."
Rock Basilisk74%
$0.63↓#312840.00↓29.9 years↓
"Whenever this creature blocks or becomes blocked by a non-Wall creature, destroy that creature at end of combat."
Kjeldoran Frostbeast74%
$0.28↓#306390.3531.3 years↓
"At end of combat, destroy all creatures blocking or blocked by this creature."