Patrolling Peacemaker 
Artifact Creature — Robot Soldier
$1.00 #2022 0.40 1.2 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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Cards similar to Patrolling Peacemaker expected a card that isn't here?
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Bloated Contaminator86%
$3.23↑#2623↓0.65↑3.7 years↑
"Whenever this creature deals combat damage to a player, proliferate."
Thrummingbird82%
$0.25↓#829↑0.30↓16.1 years↑
"Whenever this creature deals combat damage to a player, proliferate."
Atraxa, Praetors' Voice80%
$26.03↑#23621.77↑9.9 years↑
"At the beginning of your end step, proliferate."
Park Heights Maverick80%
$0.44↓#11749↓0.06↓4.5 years↑
"Whenever this creature deals combat damage to a player or dies, proliferate."
Urban Daggertooth80%
$0.24↓#10629↓0.22↓5.3 years↑
"Whenever this creature is dealt damage, proliferate."
Kalonian Hydra80%
$6.14↑#1136↑0.4813.3 years↑
"This creature enters with four +1/+1 counters on it."
Merfolk Skydiver80%
$0.26↓#6733↓0.06↓7.5 years↑
"When this creature enters, put a +1/+1 counter on target creature you control."
Hulk, Strongest There Is78%
$0.92↓#15836↓0.470.3 years
"this card enters with a +1/+1 counter on him."
Endless One78%
$0.59↓#6067↓0.00↓11.0 years↑
"This creature enters with X +1/+1 counters on it."
Ivy Elemental78%
$0.13↓#18381↓0.11↓25.1 years↑
"This creature enters with X +1/+1 counters on it."
Contaminant Grafter78%
$11.77↑#4067↓0.64↑3.7 years↑
"Whenever one or more creatures you control deal combat damage to one or more players, proliferate."
Guildpact Informant78%
$0.51↓#8791↓0.00↓7.5 years↑
"Whenever this creature deals combat damage to a player or planeswalker, proliferate."
Grateful Apparition78%
$0.19↓#18130.17↓7.5 years↑
"Whenever this creature deals combat damage to a player or planeswalker, proliferate."
Faithful Watchdog77%
$0.19↓#8980↓0.00↓2.3 years↑
"This creature enters with three +1/+1 counters on it."
Adaptive Shimmerer77%
$0.10↓#23305↓0.22↓6.5 years↑
"This creature enters with three +1/+1 counters on it."
Dueling Coach77%
$0.09↓#24102↓0.00↓5.5 years↑
"When this creature enters, put a +1/+1 counter on target creature."
Savage Firecat76%
$0.24↓#31096↓0.00↓25.1 years↑
"This creature enters with seven +1/+1 counters on it."
Vexing Radgull76%
$0.90↓#4810↓0.452.6 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%
$0.76↓#4130↓0.10↓4.5 years↑
"This creature enters with X +1/+1 counters on it."
Nimbus Swimmer75%
$0.20↓#14004↓0.00↓13.7 years↑
"This creature enters with X +1/+1 counters on it."