Metal Impulse

[Main] Trash up to 3 cards in your hand. For each card trashed by this effect, [De-Digivolve 1] 1 of your opponent's Digimon. (Trash 1 card from the top of one of your opponent's Digimon. If it has no digivolution cards, or becomes a level 3 Digimon, you can't trash any more cards.) Then, delete 1 of your opponent’s level 4 or lower Digimon.
[Security] [Security] Activate this card's [Main] effect.