Ring of Kalonia
Equipped creature has trample. (If it would assign enough damage to its blockers to destroy them, you may have it assign the rest of its 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.)