One thing I have no seen mentioned here is... Do not under any circumstance summon. Since you can get Claudia from the current event that is pretty much your needed duelist (Since they no longer give Kerry). Save up 60 SC instead of 50 SC if you are going the stamp card route. The buy all your box expansion and second barracks. It may seems like a waste now, but later you may regret those summons (like me.... my second barracks is completely full and I'm not using my gift box as storage due to room issues... wish I didn't summon and have my third barracks right about now).