Ring of Kalonia (Magic 2013 212) - Uncommon Magic: The Gathering Card

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.)