Slaughter Specialist 
Creature — Vampire Warrior
$0.88 #4703 0.30 5.1 years
When this creature enters, each opponent creates a 1/1 white Human creature token.
Whenever a creature an opponent controls dies, put a +1/+1 counter on this creature.
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Cards similar to Slaughter Specialist expected a card that isn't here?
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"Whenever a creature an opponent controls dies, put a +1/+1 counter on this card."
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"Whenever a nontoken creature an opponent controls dies, put a +1/+1 counter on each creature you control."
Legolas, Counter of Kills84%
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"Whenever a creature an opponent controls dies, put a +1/+1 counter on this card."
Kraven the Hunter84%
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"Whenever a creature an opponent controls with the greatest power among creatures that player controls dies, draw a card and put a +1/+1 counter on this card."
Rockslide Elemental82%
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"Whenever another creature dies, you may put a +1/+1 counter on this creature."
Swarm of Bloodflies82%
$0.08↓#13969↓0.3612.1 years↑
"Whenever another creature dies, put a +1/+1 counter on this creature."
Scavenger Drake82%
$0.15↓#22567↓0.06↓18.0 years↑
"Whenever another creature dies, you may put a +1/+1 counter on this creature."
Sengir Connoisseur81%
$0.18↓#20744↓0.00↓4.1 years
"Whenever one or more other creatures die, put a +1/+1 counter on this creature. This ability triggers only once each turn."
Hunted Lammasu81%
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"When this creature enters, target opponent creates a 4/4 black Horror creature token."
Rot Shambler80%
$0.18↓#13829↓0.3011.0 years↑
"Whenever another creature you control dies, put a +1/+1 counter on this creature."
Unruly Mob80%
$0.04↓#18200↓0.00↓15.1 years↑
"Whenever another creature you control dies, put a +1/+1 counter on this creature."
Gavony Unhallowed80%
$0.09↓#20015↓0.08↓10.2 years↑
"Whenever another creature you control dies, put a +1/+1 counter on this creature."
Vengeful Townsfolk80%
$0.13↓#20807↓0.00↓2.5 years↓
"Whenever one or more other creatures you control die, put a +1/+1 counter on this creature."
Lumberknot80%
$0.12↓#15549↓0.00↓15.1 years↑
"Whenever a creature dies, put a +1/+1 counter on this creature."
Algae Gharial80%
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"Whenever another creature dies, you may put a +1/+1 counter on this creature."
Thanos, Death's Consort80%
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"Whenever another creature dies, put a +1/+1 counter on this card."
Guardian Kirin80%
$0.06↓#24863↓0.05↓5.3 years
"Whenever another creature you control dies, put a +1/+1 counter on this creature."
Hunted Phantasm80%
$3.75↑#12549↓0.00↓21.0 years↑
"When this creature enters, target opponent creates five 1/1 red Goblin creature tokens."