The [EX1-053] MetalEtemon card effect:
[Opponent's turn]: For each Digimon card with "Etemon" in its name in your trash, this Digimon gets +1000DP
[On Deletion]: "De-digivolve 1" 1 of your opponent's Digimon
* The official bandai website translated wrongly for this card first effect, it is written [Your Turn] in English translation but the Japanese words is [Opponent's Turn].
Normally I will immediately digivolve this LV6 MetalEtemon into OmnimonZwart for 6 costs to retrieve the LV5 blocker Etemon that just got destroyed (if I have Zwart in hands). The LV7 Omnimon Zwart is the best choice (in my opinion) as LV7 Digimon for this deck. It can widen the board, and take back 1 or 2 LV5 Etemon blocker to play for free.