Ring of Kalonia [Magic 2013]

Set: Magic 2013 Type: Artifact — Equipment Uncommon Cost: {2} 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.)