The [BT2-016] Volcanicdramon is quite useful for Megazoo deck. We can play him to destroy all opponent's digimon with 4000 or less DP, Attack Security in next turn, then digivolve to LV7 Omimon ALter-S, Chaosmon, Millenniummon or Ragnaloardmon. The [BT3-112] Omnimon Alter-S can "de-digivolve 1" to all opponent's digimon and then destroy all opponent's digimon with 5000DP or less. This deck uses 4 copies of Omnimon Alter-S (expensive cards) to ensure this strategy. I always think the Omnimon Alter-S is very powerful to clean the opponent's board. The other LV7 digimon, Milleniumon and Chaosmon, create another disaster when they appear in the battle. The advantage of Millenium is, it can return 1 opponent's digimon to bottom of their deck, come back to life after get destroyed by removing its digivolution source, for Chaos – it can target unsuspended digimon, which is very useful to destroy a powerful digimon in opponent side.