Ring of Kalonia 
Artifact — Equipment
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 {1} ({1}: Attach to target creature you control. Equip only as a sorcery.)
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Cards that do something similar expected a card that isn't here?
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Ring of Xathrid 82%
$0.48#6759
"At the beginning of your upkeep, put a +1/+1 counter on equipped creature if it's black."
+1 more matching line
Ring of Evos Isle 81%
$0.60#7081
"At the beginning of your upkeep, put a +1/+1 counter on equipped creature if it's blue."
+1 more matching line