These LV6 digimon, 2 of green and 1 of yellow, that are able to make the Rookie-Rush deck scares. The [BT4-049] Varodurumon, by trashing 3 cards of this digimon digivolution source, all of opponent's digimon get -4000DP. The Rookie-Rush digimon is normaly LV3 low cost digimon, their DP are just around 2000 or 3000. So using this digimon to reduce DP to zero will be super effective way to swipe out the rookie. The second digimon, [BT4-060] Lotosmon, at all turn – if opponent's plays a LV4 or lower digimon, suspend that digimon. This card help to suspend them so it can be destroyed in your turn. But if you are not able to destroy them, those digimon will be active in their next turn. The other green LV6 digimon, [BT4-062] Nidhoggmon, when digivolving: by trashing 4 cards in digivolution source if this digimon, you can suspend all of opponent digimon with 5000DP or less. Then, place all opponent's suspended digimon at the bottom of their decks in any order.
The Varodurumon and Nidhoddmon must be digivolved from LV2 digitama or LV3digimon, which is heavy constrained to protect it and safely build up to LV6. Once <digi-burst> is used to trigger the effect, they become a normal digimon (because they would have no more evolution source). At the other hand, Lotosmon main effect is active in both player's turn. So if the opponent don't destroy the Lotosmon, she will keep suspend the low level digimon if they are played.