Encroaching Darkness Demigra (Power Booster)

[Over Realm 4] [Permanent] All "Demigra" cards in your hand with energy costs of 7 gain [Xeno-Evolve] (3) : "Demigra". [Auto] When you play this card, you can't play non-black Battle Cards for the duration of the turn, and your opponent can't attack with Battle Cards with an original power of 10000 or less until the end of their next turn.