This clever loop transforms a humble druid into a boundless mana engine by turning the rules of the battlefield to your advantage. First, you must attach Silverskin Armor to Leafkin Avenger, endowing the elf with the artifact type so it becomes a valid target for mechanical manipulation. With that foundation set, you can tap Leafkin Avenger for a surge of green mana, then feed a portion of those funds back into Voltaic Construct to untap the druid and ready it for action once more. Because the cost to untap is cheaper than the mana generated by a well-populated board, you are left with an endless reservoir of green energy to fuel whatever grand designs you hold in hand.