Apocalypse Apocalymon

This deck turbo trashes lvl6s so that you can quickly play Apocalymon. 

Use your dark masters as materials to summon apocalymon for 3 cost then add in your crani and metallic to stave off your opponent for 2 turns. After 3 turns of an apocalymon on the field you should have successfully trashed 20 cards from your opponents deck and put them at deck out. Summoning more apocalymon will speed up the process. 

Magnadramon is added for extra spice and survivability but can be switched out for any on play lvl 6. Volcanicdramon is a good tech in for the deletion as well as bancholeomon for the sec - and suspend. 

May work on a yellow based lvl 6 line up.

Edit: After some testing I think Underworld's Call may be a bit of a detriment and BT14 option with the same discard effect can help better for floodgates that prevent reducing play cost. Magnadramon may also be a detriment to the lvl6 line up and can cause more bricking in this version of the deck as opposed to the primarily yellow line up. Having 3 copies of the Darkmasters is definitely more important since they are required for getting Apocalymon out and possibly setting each to 4 copies might be more beneficial, needs more testing. The Matts are good but not necessary so removing them and Magna for the 4th copy of the darkmasters may help with bricking bit as of testing this is definitely the most consistent and definitely allows for you to discard an necessary lvl6 on every turn.

Edit 2: Removing the option cards to draw on discard and the Matt tamers then replacing with combinations of takumi and Digi Emperor have proven to play very fun into the deck. Though they often time can be dead cards in hand to just discard, Ive found them to be a very good way to pass turn and put additional pressure on an opponent who may be relying on moving up lvl3s to advance their field. Digimon emperor basically costs your opponent a lvl4 digivolve by moving up a lvl 3 and takumi insures that lvl3s are not going to be attacking. This works predominantly in your favor because you will most likely only be using lvl4 digimon to attack. Tapirmon may also work in place of phascomon as it allows your lvl4s who are going for a deletion anyway to possibly cull the field while swinging. All of these changes however to damage consistency in the deck, though takuma does have more value as it alows you to draw an additional card while going to a lvl4 on field so that you have more fuel for the draw trash. Digimon emperor does allow for more slowdown on your opponents side as well as giving blocker apocalymon more value but I dont think its high enough to warrant the 3 play cost unless you already have apocalymon and desperately need to pass turn. All in all a very fun way to slow your opponent down to basically make all their lvl3s useless however losing a counter to digimon like psychemon does work as a detriment to the deck. Possibly try cutting underworld and the Matts to add in 3 copies of a combination of each and go from there. Definitely a personal preference.