Patrolling Peacemaker 
Artifact Creature — Robot Soldier
$0.63 #2149 0.45 1.1 years
This creature enters with two +1/+1 counters on it.
Whenever an opponent commits a crime, proliferate. (They commit a crime if they target an opponent, anything an opponent controls, and/or cards in an opponent's graveyard. To proliferate, you choose any number of permanents and/or players, then give each another counter of each kind already there.)
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Thrummingbird86%
$0.25↓#845↑0.22↓15.9 years↑
"Whenever this creature deals combat damage to a player, proliferate."
Bloated Contaminator86%
$3.28↑#2593↓0.68↑3.6 years↑
"Whenever this creature deals combat damage to a player, proliferate."
Atraxa, Praetors' Voice80%
$24.32↑#24751.72↑9.8 years↑
"At the beginning of your end step, proliferate."
Park Heights Maverick80%
$0.40↓#11435↓0.00↓4.4 years↑
"Whenever this creature deals combat damage to a player or dies, proliferate."
Urban Daggertooth80%
$0.26↓#10409↓0.07↓5.2 years↑
"Whenever this creature is dealt damage, proliferate."
Merfolk Skydiver80%
$0.24↓#6599↓0.15↓7.3 years↑
"When this creature enters, put a +1/+1 counter on target creature you control."
Endless One78%
$1.00↑#6024↓0.05↓10.9 years↑
"This creature enters with X +1/+1 counters on it."
Ivy Elemental78%
$0.15↓#17976↓0.19↓24.9 years↑
"This creature enters with X +1/+1 counters on it."
Contaminant Grafter77%
$13.98↑#3987↓0.453.6 years↑
"Whenever one or more creatures you control deal combat damage to one or more players, proliferate."
Grateful Apparition77%
$0.18↓#18360.18↓7.3 years↑
"Whenever this creature deals combat damage to a player or planeswalker, proliferate."
Guildpact Informant77%
$0.54↓#8851↓0.527.3 years↑
"Whenever this creature deals combat damage to a player or planeswalker, proliferate."
Faithful Watchdog77%
$0.17↓#8717↓0.24↓2.2 years↑
"This creature enters with three +1/+1 counters on it."
Adaptive Shimmerer77%
$0.12↓#23169↓0.00↓6.4 years↑
"This creature enters with three +1/+1 counters on it."
Savage Firecat76%
$0.28↓#30772↓0.24↓24.9 years↑
"This creature enters with seven +1/+1 counters on it."
Vexing Radgull75%
$1.39↑#4734↓0.21↓2.5 years↑
"Whenever this creature deals combat damage to a player, that player gets two rad counters if they don't have any rad counters. Otherwise, proliferate."
Shivan Devastator75%
$3.35↑#4151↓0.21↓4.4 years↑
"This creature enters with X +1/+1 counters on it."
Nimbus Swimmer75%
$0.21↓#13674↓0.00↓13.6 years↑
"This creature enters with X +1/+1 counters on it."
Metastatic Evangel73%
$0.37↓#1514↑0.33↓2.2 years↑
"Whenever another nontoken creature you control enters, proliferate."
Kavu Primarch73%
$0.06↓#23338↓0.4019.3 years↑
"If this creature was kicked, it enters with four +1/+1 counters on it."
Inexorable Tide72%
$1.13↑#1036↑0.66↑15.9 years↑
"Whenever you cast a spell, proliferate."