[When Digivolving][When Attacking] You may trash up to 2 blue cards in your hand. For each one, trash any 1 card under your opponent's Digimon or Tamers. Then, you may return 1 of your opponent's Digimon with no digivolution cards to the bottom of the deck.
[All Turns][Once Per Turn] When one of your blue Digimon would be deleted, by returning 3 cards with [Jellymon] in their texts from your trash to the bottom of the deck in any order, prevent its deletion.
Rulings Q&A — 2 entries
Q1Q4093
When I trash multiple blue cards in my hand, can I use this card's [When Digivolving] [When Attacking] effect to choose separate opponent's Digimon or Tamers and trash the cards under each one?
Can I use "choose 1 card under an opponent’s Digimon or Tamer and trash it" in this card's [When Digivolving][When Attacking] effect to choose any card from among the cards under the target opponent's Digimon or Tamer and trash it? Or can I only trash the bottom card?
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Official Ruling
The player that activated this effect can choose any card from among the cards under that card and trash it.