CatchMamemon

[When Digivolving] You may return up to 4 Digimon cards with [Mamemon] in their name from your hand and/or trash to the top of your deck in any order. If you return 3 or more cards using this effect, ＜De-Digivolve 1＞ 1 of your opponent's Digimon (Trash the top card. You can't trash past level 3 cards).