DeathXmon

When you would play this card, reduce its memory cost by 3 for each Digimon and Tamer your opponent has in play.
[On Play] [When Digivolving] ＜De-Digivolve 1＞ all of your opponent's Digimon. (Trash the top card. You can't trash past level 3 cards.) Then, delete all of your opponent's level 4 or lower Digimon.
[End of Opponent's Turn] [Once Per Turn] Delete all of your opponent's Digimon with the lowest play cost.