I used a similar deck to get around 10K DP in the KC Cup. I used Michizure instead of Mirror Wall cause I don't have the card, and I would also replace Flash Assailant with a simple beater like Dunames or Battle Ox or something like that. Also perhaps a second Twin Barrel would be good too. Just experiment to see what you like.
Replaced Half Shut with one of my rewards, a Prismatic E-Con.
Sorry about that, that person who commented with my name is not actually me. Yeah, you get both Relinquished from the old Pegasus event (not sure if it's coming back, but it probably is since the Yugi Mutou event returned)