Pests of Honor 

Creature — Mouse
$0.25 #16933 0.07 3.1 years
Celebration — At the beginning of combat on your turn, if two or more nonland permanents entered the battlefield under your control this turn, put a +1/+1 counter on this creature.
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Savageborn Hydra88%
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"This creature enters with X +1/+1 counters on it."
Rushwood Elemental88%
$1.04↑#28334↓0.0027.0 years↑
"At the beginning of your upkeep, you may put a +1/+1 counter on this creature."
Child of the Volcano86%
$0.12↓#23322↓0.062.9 years
"At the beginning of your end step, if you descended this turn, put a +1/+1 counter on this creature."
Celebrity Fencer85%
$0.20↓#187960.004.5 years↑
"Whenever another creature you control enters, put a +1/+1 counter on this creature."
EPF Point Squad85%
$0.07↓#22367↓0.17↑0.6 years↓
"Whenever another creature you control enters, put a +1/+1 counter on this creature."
Swarm of Bloodflies85%
$0.08↓#139690.36↑12.1 years↑
"This creature enters with two +1/+1 counters on it."
Air Nomad Student84%
$0.17↓#24735↓0.090.9 years↓
"At the beginning of your end step, if this creature didn't attack this turn, put a +1/+1 counter on it."
Deep Goblin Skulltaker84%
$0.15↓#190930.002.9 years
"At the beginning of your end step, if you descended this turn, put a +1/+1 counter on this creature."
Contortionist Troupe84%
$0.20↓#174770.27↑5.1 years↑
"This creature enters with X +1/+1 counters on it."
Ash, Party Crasher84%
$0.17↓#161900.063.1 years
"Whenever this card attacks, if two or more nonland permanents entered the battlefield under your control this turn, put a +1/+1 counter on this card."
Botanical Brawler83%
$0.26↑#6899↑0.063.5 years
"This creature enters with two +1/+1 counters on it."
Faithful Watchdog83%
$0.19↓#8980↑0.002.3 years
"This creature enters with three +1/+1 counters on it."
Adaptive Shimmerer83%
$0.10↓#23305↓0.22↑6.5 years↑
"This creature enters with three +1/+1 counters on it."
Fairgrounds Trumpeter82%
$0.09↓#199570.0010.1 years↑
"At the beginning of each end step, if a +1/+1 counter was put on a permanent under your control this turn, put a +1/+1 counter on this creature."
Juniper Order Ranger82%
$0.15↓#8248↑0.18↑21.2 years↑
"Whenever another creature you control enters, put a +1/+1 counter on that creature and a +1/+1 counter on this creature."