That mysterious sword can be used by someone chosen by the heaven or someone exilied to the hell.
[Equip Cost] [Pay 1 gauge] If you have a [Set] Spell with "Gate of" in your field you can equip this card without pay its [Equip Cost] If the number of cards of your drop zone is six or less or, ten or more, this card can attack even if you have a monster in your center. When this card attacks, if you have three or less cards in your drop zone, choose one of your monsters and gets Power +4000. When this card attacks if you have thirteen or more cards in your drop zone, choose one of your monsters and gets critical +1. [Double Attack]