Ring of Kalonia 
Artifact — Equipment
$0.40 #8950 0.33 14.1 years
Equipped creature has trample. (It can deal excess combat damage to the player or planeswalker it's attacking.)
At the beginning of your upkeep, put a +1/+1 counter on equipped creature if it's green.
Equip
(
: Attach to target creature you control. Equip only as a sorcery.)
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Cards similar to Ring of Kalonia expected a card that isn't here?
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Oran-Rief, the Vastwood85%
$0.39↓#727↑0.19↓16.9 years↑
"
: Put a +1/+1 counter on each green creature that entered this turn."
Ivy Lane Denizen83%
$0.24↓#2460↑0.19↓13.6 years
"Whenever another green creature you control enters, put a +1/+1 counter on target creature."
Bloodhall Ooze82%
$0.52↑#21493↓0.07↓17.6 years↑
"At the beginning of your upkeep, if you control a green permanent, you may put a +1/+1 counter on this creature."
O-Naginata82%
$0.52↑#72390.19↓21.3 years↑
"Equipped creature gets +3/+0 and has trample."
+1 more matching line
Reverent Hunter82%
$0.21↓#19025↓0.00↓12.9 years↓
"When this creature enters, put a number of +1/+1 counters on it equal to your devotion to green."
Crabapple Cohort80%
$0.08↓#29591↓0.16↓18.3 years↑
"This creature gets +1/+1 as long as you control another green creature."
Horned Helm78%
$0.10↓#20755↓0.21↓22.3 years↑
"Equipped creature gets +1/+1 and has trample."
+1 more matching line
Dwarven Hammer76%
$0.07↓#14167↓0.00↓5.6 years↓
"Equipped creature gets +3/+0 and has trample."
+1 more matching line
Nylea's Huntmaster75%
$0.07↓#24820↓0.306.6 years↓
"When this creature enters, target creature you control gets +X/+0 until end of turn, where X is your devotion to green."
Raven Clan War-Axe74%
$0.22↓#14283↓0.382.2 years↓
"Equipped creature gets +2/+0 and has trample."
+1 more matching line
Nylea, God of the Hunt74%
$9.62↑#3363↑0.2712.9 years↓
"Other creatures you control have trample."
+1 more matching line
Training Regimen74%
$0.27↓#11916↓0.00↓0.2 years↓
"Creatures you control with +1/+1 counters on them have trample."
Call of the Full Moon74%
$0.09↓#26419↓0.53↑11.1 years↓
"Enchanted creature gets +3/+2 and has trample."
Yorvo, Lord of Garenbrig74%
$0.38↓#93640.406.9 years↓
"Whenever another green creature you control enters, put a +1/+1 counter on this card. Then if that creature's power is greater than this card's power, put another +1/+1 counter on this card."