[Main] Trigger <De-Digivolve 1> on 1 of your opponent's Digimon (Trash up to 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, if that Digimon's play cost is 4 or less, delete it.