The Seal of Orichalcos

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 Special Summoned monsters you control. You cannot Special Summon monsters from your Extra Deck. You can only activate "The Seal of Orichalcos" once per Duel.

So my question is regarding the highlighted text there. Supposed I have 2 monsters with the same attack, so...none can be attacked?

plz correct me if im wrong but i think it means that both of them can be atked, as the requirement for the usage of orichalcos' effect is to have a monster of lower atk then another on ur side of the field

can't attack at all.

"if you have two, or more face-up attack position monsters with the same attack, and no other monsters, your opponent can't attack any of them"

http://yugioh.wikia.com/wiki/Card_Tips:The_Seal_of_Orichalcos

google is your friend.

Guts is right. There's a reason it says monster(s)

Can't attack any in that case, has happened to me irl, awesome card