First take advantage of a Digimon like [BT14-023 Ikkakumon] that can trash digivolution cards and reduce the number of powerful digivolution cards under your opponent's Digimon. Once their total digivolution cards have decreased, [BT14-002 Bukamon]'s effect gives it <Jamming>. Then, attack with a level 4 Digimon like [BT14-023 Ikkakumon].
When your opponent attacks, <Blast Digivolve> into [BT14-026 Zudomon ACE]!
Remove even more digivolution cards when countering, and return opponent's Digimon with no digivolution cards to their hand.
Once you've reduced your opponent's security stack enough, digivolve into [BT14-029 Plesiomon], then trash their digivolution cards and use unsuspended attacks to claim victory!