Looking Back on the Good Times [BT3-107] [Release Special Booster Ver.1.0]

[Main] Trigger ＜De-Digivolve 1＞ on 1 of your opponent's Digimon. (Trash a 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.