I always love to use [BT2-055] Toyagumon in my black deck, because it gives this digimon "Reboot", accompanying with [BT2-063] Metalgreymon, its inheritance is "If this digimon has Reboot, <SecurityCheck+1>. If we build these 2 cards under evolution source for BlackWarGreymon, for first and second security attack, we will have <Security+1>, so for 2 turns, the BlackWargreymon checks upto 4 securities. For the last check we have to remove LV3 Toyagumon and LV5 MetalGreymon, we only have 1 security check left to wipe out opponent's security pile.