Dusk Urchins 

Creature — Ouphe
Whenever this creature attacks or blocks, put a -1/-1 counter on it.
When this creature dies, draw a card for each -1/-1 counter on it.
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Wicker Warcrawler 98%
$0.30#23534
"Whenever this creature attacks or blocks, put a -1/-1 counter on it at end of combat."
Retched Wretch 89%
$0.16#21677
"When this creature dies, if it had a -1/-1 counter on it, return it to the battlefield under its owner's control and it loses all abilities."
Lockjaw Snapper 85%
$1.07#15502
"When this creature dies, put a -1/-1 counter on each creature with a -1/-1 counter on it."
+1 more matching line
The Reaper, King No More 85%
$0.69#6269
"Whenever a creature an opponent controls with a -1/-1 counter on it dies, you may put that card onto the battlefield under your control. Do this only once each turn."
Necroskitter 84%
$0.71#2975
"Whenever a creature an opponent controls with a -1/-1 counter on it dies, you may return that card to the battlefield under your control."
+1 more matching line
Soulstinger 83%
$0.11#19198
"When this creature dies, you may put a -1/-1 counter on target creature for each -1/-1 counter on this creature."
Grief Tyrant 82%
$0.19#25487
"When this creature dies, put a -1/-1 counter on target creature for each -1/-1 counter on this creature."
Kjeldoran Home Guard 82%
#29964
"At end of combat, if this creature attacked or blocked this combat, put a -0/-1 counter on this creature and create a 0/1 white Deserter creature token."
Oft-Nabbed Goat 82%
$0.29#6334
"When this creature dies, if it had one or more -1/-1 counters on it, its owner draws that many cards and each other player loses that much life."
Encumbered Reejerey 82%
$0.13#22558
"Whenever this creature becomes tapped while it has a -1/-1 counter on it, remove a -1/-1 counter from it."
Auntie Ool, Cursewretch 81%
$0.39#6701
"Whenever one or more -1/-1 counters are put on a creature, draw a card if you control that creature. If you don't control it, its controller loses 1 life."
Moonshadow 81%
$11.52#8935
"Whenever one or more permanent cards are put into your graveyard from anywhere while this creature has a -1/-1 counter on it, remove a -1/-1 counter from this creature."
Dread Tiller 81%
$0.25#6417
"Whenever a creature with a -1/-1 counter on it dies, you may put a land card from your hand or graveyard onto the battlefield tapped."
Ammit Eternal 80%
$1.18#11132
"Whenever an opponent casts a spell, put a -1/-1 counter on this creature."
+1 more matching line
Lethal Sting 80%
$0.25#18085
"As an additional cost to cast this spell, put a -1/-1 counter on a creature you control."