Asher, New Life

Indestructible, Asher can be your commander.
Enchant target creature.
Enchanted creature has lifelink.
Whenever Asher is not enchanting a creature,
enchant target creature.
{w}, sacrifice an artifact with mana value 1 or less:
gain 4 life. Then, if you have 80 or more life,
exile Asher, then return him to the battlefield transformed under his owner's control.