Focus on trashing [dex] cards that activate from trash to give a second life to your digimon to allow aggressive attacking, non-trash [dex] cards are cheap evolutionary steps to draw, activate on-digivolving effects and setup for DeathXmon's life saving effect.
Utilise [Tyrannomon], [Marvin Jackson], [Castle of the Nine Wolves] and the non-trash dorugamons effect: to trash [dex] cards that can digivolve from the trash as well as to get DeathXmon into the trash for [The Apostle of Doom Descends]