Dark Control Demon God Demigra (BT4-106) - Colossal Warfare

[Dark Over Realm 4] 3 (If you have at least 4 black cards in your Drop Area, you can play this card by sending all cards in your Drop Area to your Warp. [Over Realm] and [Dark Over Realm] can only be activated once per turn)
[Auto] When this card attacks, your opponent chooses 1 card from their hand and sends it to their Warp. If that card was a Battle Card, combo with it in your Combo Area.