As Samael said, an Archangel is too powerful. There are only 4 of them at any given time (although technically 5, since one is Fallen). Michael, Raphael, Gabriel, Uriel, and Lucifer.
I suggest you tweak your last two aspects as well. They seem to blend, to me.
Otherwise, I have a good custom power for a Flaming Sword of God.
-2 Elemental Weapon
Musts: An Aspect Related To The Power
Skill(s): Weapons
The user is able to summon a two-handed weapon made of an element of his choosing. A claymore of fire, a greataxe of ice, a hammer of rock, and a spear of lightning are all possible.
Effects
Large Weapon: Your Elemental Weapon is a large weapon, rated at Weapon 3.
Always at Hand: Your Elemental Weapon requires no sheath. It can be summoned to your hand for a Supplemental Action, and dispelled as a free action.
Attuned: Your Elemental Weapon is attuned to you. If it leaves your hand, whether dropped, thrown, or disarmed, it will vanish. A Supplemental Action may summon it to your hand again.
Made of the Elements: Your Elemental Weapon may fulfill Catches if thematically appropriate.