REGISTER TO REMOVE ADS
I think you get it from leveling up, but I'm not sure. It requires Stop magic though, so get all of them that you can.
Make your deck so that you take advantage of your best Sleights, like Sonic Blade and Ars Arcananum. Keep a good amount of 0's for his own big Sleights, and maybe splash in a few Blizzard cards. Keep plenty of cures too. Also, if you have the Sleight Fatal Frame, spamming that pretty much leads to auto victory.