Forum:"The Seal of Orichalcos": Effect (Pretty Much) Confirmed

Okay, so the effect for "The Seal of Orichalcos" is pretty much confirmed.
 * "The Seal of Orichalcos" Field Spell All monsters you control gain 500 ATK. Once per turn, this card cannot be destroyed by card effects. While you control 2 or more face-up Attack Position monsters, your opponent cannot target your monster(s) with the lowest ATK for an attack. When this card is activated: Destroy all Specials Summoned monsters you control. You cannot Special Summon from the Extra Deck. You can only activate "The Seal of Orichalcos" once per Duel.

So, what are some opinions on this effect? What decks would it be useful in? Does its effect do the anime justice? All these questions are yours to answer. (NOTE: Do not edit the article to say this effect just yet, as Konami has not announced it. We must not jump to any conclusions, even if there are obvious.)