I heard Konami just created a card that allows you to swap a field spell in your graveyard for one that your opponent currently controls So you can grab Seal of Orichalcos from your grave, give it to your opponent and you get their Mystic Mine, effectively locking him/her out of his/her extra deck AND the game itself :hestonpls Ah yes, the Kairyu-Shin lock. Somebody did that to me once Annoying as hell Sadly, no side deck option in Master Duel yet