Tromell, Seymour's Butler 

Legendary Creature — Elf Advisor
$0.30 #3942 0.31 1.4 years
Each other nontoken creature you control enters with an additional +1/+1 counter on it.
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Metastatic Evangel90%
$0.37↑#1514↑0.302.3 years
"Whenever another nontoken creature you control enters, proliferate."
Mabel, Valley Hero84%
$0.20↓#21925↓0.09↓0.0 years↓
"Whenever this card or another creature you control enters, put a +1/+1 counter on target creature that entered this turn."
Raucous Entertainer82%
$0.11↓#18639↓0.05↓2.5 years↑
"
,
: Put a +1/+1 counter on each creature you control that entered this turn."
Tainted Observer80%
$0.27↓#7212↓0.393.7 years↑
"Whenever another creature you control enters, you may pay
. If you do, proliferate."
Good-Fortune Unicorn80%
$0.28↓#35460.15↓7.4 years↑
"Whenever another creature you control enters, put a +1/+1 counter on that creature."
Merfolk Skydiver79%
$0.26↓#6733↓0.06↓7.5 years↑
"When this creature enters, put a +1/+1 counter on target creature you control."
+1 more matching line
Juniper Order Ranger78%
$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."
Renata, Called to the Hunt77%
$0.18↓#2981↑0.14↓6.7 years↑
"Each other creature you control enters with an additional +1/+1 counter on it."
Renegade Krasis74%
$0.32↑#15047↓0.06↓13.5 years↑
"Whenever this creature evolves, put a +1/+1 counter on each other creature you control with a +1/+1 counter on it."
Novijen, Heart of Progress74%
$0.35↑#7444↓0.04↓20.5 years↑
"
,
: Put a +1/+1 counter on each creature that entered this turn."
Atraxa, Praetors' Voice74%
$26.03↑#2362↑1.77↑9.9 years↑
"At the beginning of your end step, proliferate."
Gorma, the Gullet73%
$0.58↑#7303↓0.270.5 years
"Nontoken creatures you control enter with an additional +1/+1 counter on them for each creature that died under your control this turn."
Arwen, Weaver of Hope72%
$4.81↑#1870↑0.223.3 years↑
"Each other creature you control enters with a number of additional +1/+1 counters on it equal to this card's toughness."
Celebrity Fencer72%
$0.20↓#18796↓0.00↓4.5 years↑
"Whenever another creature you control enters, put a +1/+1 counter on this creature."
EPF Point Squad72%
$0.07↓#22367↓0.17↓0.6 years
"Whenever another creature you control enters, put a +1/+1 counter on this creature."
Warden of the Grove72%
$1.58↑#2192↑0.251.5 years
"Whenever another nontoken creature you control enters, it endures X, where X is the number of counters on this creature."
Anafenza, Kin-Tree Spirit72%
$0.26↓#6085↓0.06↓11.6 years↑
"Whenever another nontoken creature you control enters, bolster 1."