Derpovic's D-Brigade/DigiPolice (BT21 format)

BT16 Tankdramon is incredible. You must play this card. BT16 Sealsdramon is neat and allows you to play something else than BT14 Missimon as Digitama and having Rush is cool while you don't have the Numemon setup. Metropolitan Police Department, Community Safety Bureau, Cyber Crime Division, Investigation Unit 11 is a nice searcher and feels like an archetype-specific memory boost you can occasionally use. The other BT16 DigiPolice cards are not that great imo (Commandramon basically being a vanilla and Darkdramon plays badly) but the set still helps the theme to keep up with the game.

Additional notes: feel free to replace Trident Arm for DCD Bomb if you prefer this. I just found Trident Arm so much more useful to use from hand and as hard security bomb. Also, Quartzmon > DeathX for Lv7.