Blue Flare Twilight
Uses Blue Base with Missimon and both Gaossmons for draw and tempo, as I feel it's more consistent than going for black base with BT6 Pagumon and Monitamon. I keep an even spread for black and blue champions and ultimates, with 8 black champs and 8 blue champs, and with 5 black ultis and 5 blue ultis. The top end of 3 GreyKnightsmon is enough I feel, but if you really wanted to, DarkKnightmon X Antibody is a level 6 you could use. I don't feel I need options, but those are meta dependant and I can't see what's gonna be useful so far in the future meta. I feel 2 of each BT10 Tamer and 4 of the new one is the best ratio for tamers, giving 2 setters, 2 searchers (with blocker aura) and 4 "memory/card resource" tamers. Lastly, Ice Wall is a broken Option, and while I originally didn't have Blazing in the deck because I thought there would be too many whiffs, but after testing, with 2/3rds of the deck being hits (and 6 tamers being additional hits) I think it's a very good include.
I gotta say, when I first looked at this deck, I thought it would be trash, but after seeing the tops in the East and re-evaluating my biases, I can see this being a decent rogue pick in the BT12/EX4 metagame.