Xiphos [Gunslinger in the Abyss]

During your turn, Xiphos also becomes a Forward with 7000 power, "When Xiphos is blocked, all the Forwards opponent controls lose 3000 power until the end of the turn." and "When Xiphos deals damage to your opponent, put Xiphos into the Break Zone. When you do so, choose 1 Forward of cost 4 or less opponent controls. Break it."