Phyrexian Reaper 

Creature — Phyrexian Zombie
Whenever this creature becomes blocked by a green creature, destroy that creature. It can't be regenerated.
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Evil Eye of Urborg 94%
$0.24#11870
"Whenever this creature becomes blocked by a creature, destroy that creature."
Sylvan Basilisk 94%
$0.36#24347
"Whenever this creature becomes blocked by a creature, destroy that creature."
Phyrexian Slayer 88%
$0.10#29973
"Whenever this creature becomes blocked by a white creature, destroy that creature. It can't be regenerated."
No Quarter 84%
$0.51#24934
"Whenever a creature becomes blocked by a creature with lesser power, destroy the blocking creature."
Stinkweed Imp 83%
$1.80#3062
"Whenever this creature deals combat damage to a creature, destroy that creature."
Voracious Cobra 83%
$0.28#26609
"Whenever this creature deals combat damage to a creature, destroy that creature."
Ogre Leadfoot 82%
$0.03#30965
"Whenever this creature becomes blocked by an artifact creature, destroy that creature."
Dripping Dead 82%
$0.16#30259
"Whenever this creature deals combat damage to a creature, destroy that creature. It can't be regenerated."
Grotesque Hybrid 82%
$0.22#28027
"Whenever this creature deals combat damage to a creature, destroy that creature. It can't be regenerated."
Mephitic Ooze 82%
$0.54#24995
"Whenever this creature deals combat damage to a creature, destroy that creature. The creature can't be regenerated."
Dinosaur Hunter 81%
$0.05#30094
"Whenever this creature deals damage to a Dinosaur, destroy that creature."
Horobi, Death's Wail 80%
$1.20#10336
"Whenever a creature becomes the target of a spell or ability, destroy that creature."
Infernal Medusa 80%
$5.93#26814
"Whenever this creature becomes blocked by a non-Wall creature, destroy that creature at end of combat."