Etched Slith 

Artifact Creature — Phyrexian Slith
Menace
Whenever this creature deals combat damage to a player, put a +1/+1 counter on it. When you do, you may remove a counter from another target permanent or opponent.
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Heirs of Stromkirk 99%
$0.11#23476
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
+1 more matching line
Slith Predator 99%
$0.12#28589
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Falkenrath Exterminator 99%
$0.24#17576
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Slith Bloodletter 99%
$0.12#29236
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Slith Firewalker 99%
$0.14#27699
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Bloodmad Vampire 99%
$0.20#12098
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Stromkirk Noble 99%
$0.12#13270
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Guild Thief 99%
$0.21#22501
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Markov Blademaster 99%
$0.31#13295
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Bloodcrazed Neonate 99%
$0.13#22367
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Slith Ascendant 99%
$0.05#24600
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Slith Strider 99%
$0.10#27715
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Erdwal Ripper 99%
$0.25#25110
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Havengul Vampire 99%
$0.26#20873
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Stromkirk Patrol 99%
$0.12#27043
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Arcbound Slith 99%
$0.55#8872
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Hexgold Slith 99%
$0.18#22586
"Whenever this creature deals combat damage to a player, put a +1/+1 counter on it."
Conclave Sledge-Captain 89%
$1.76#7205
"Whenever this creature deals combat damage to a player, put that many +1/+1 counters on it."
Westgate Regent 89%
$0.31#13389
"Whenever this creature deals combat damage to a player, put that many +1/+1 counters on it."