When this creature is put into the Battle Zone, return a card from your Mana Zone to your hand. Afterward, your opponent returns a card from his/her Mana Zone to their hand. Over Drive Darkness x2 (When this creature is summoned, you may tap 2 extra Darkness cards. If so, it gains the following [OD] ability.) [OD]: When this creature is put into the Battle Zone, choose a civilization. Look at your opponent's hand and choose a card with the chosen civilization. Your opponent discards that card.