[Main] Reveal the top 3 cards of your deck. Choose 1
Digimon card with [X Antibody] in its traits among
them, and delete 1 of your opponent’s Digimon whose
play cost is less than or equal to the chosen card's
play cost. Trash the revealed cards. Then, place 1
card with [X Antibody] in its traits from your trash
under 1 of your Digimon with [X Antibody] in its
traits as its bottom digivolution card.