When Attacking This Digimon can digivolve into a Digimon card with the X Antibody trait in your hand by paying its digivolution cost.
Rulings
Q1: Does this card have inherited effects even though it's an Option card?
Yes. This card's Main effect can place it in a Digimon’s digivolution cards, and it has inherited effects. As with Digi-Egg cards and Digimon cards, this card's inherited effects can activate while it's placed in a Digimon’s digivolution cards.
Q2: Can this card's inherited effect digivolve a Digimon that doesn't meet the digivolution requirements into a Digimon card with X Antibody in its traits in my hand?
No, you can’t ignore digivolution requirements when using this card's effect.
Q3: Can I activate an effect that reduces the digivolution cost when digivolving using this card's inherited effect?
Yes, as long as the activation conditions are met.
Q4: Can this card be trashed by Digi-Burst effects on Digimon with this card in its digivolution cards?
No. Trashing by Digi-Burst is also trashing by an effect.
Q5: What happens if this card becomes the top card after a Digimon with this card in its digivolution cards is affected by {{DeDigivolve}}?
As with Digimon without DP, this card can't exist in the battle area as the top card, therefore it's trashed. This isn't considered deletion. If this card has other digivolution cards under it, they are also trashed.
Q6: What happens if a "trash the bottom 2 digivolution cards of your opponent's Digimon" effect activates on a Digimon with this card as its bottom digivolution card?
Effects can't trash this card, therefore only the digivolution card on top of this card is trashed.
Q7: There are 8 digivolution cards under EX2-007 Mother D-Reaper, and this card is the bottom card. Does the "you may trash 7 or more digivolution cards from the bottom of 1 of your EX2-007 Mother D-Reapers to set this Digimon's play cost to 0" effect activate when my EX2-055 Reaper is played?
It can activate in such cases if you declare to trash 8 cards and then trash 7 cards except for BT9-109 X Antibody.
Data Sources
X Antibody BT9-109 U While you have a Digimon in play, you may use this card without meeting its color requirements. [Security] Gain 1 memory, and add this card to its owner's hand. [Main] Place this card under 1 of your Digimon without [X Antibody] in its digivolution cards as its bottom digivolution card. --- [All Turns] Effects can't trash [X Antibody] in this Digimon's digivolution cards.[When Attacking] This Digimon can digivolve into a Digimon card with [X Antibody] in its traits in your hand for its digivolution cost.
X Antibody BT9-109 U X Antibody While you have a Digimon in play, you may use this card without meeting its color requirements. [Security] Gain 1 memory, and add this card to its owner's hand. [Main] Place this card under 1 of your Digimon without [X Antibody] in its digivolution cards as its bottom digivolution card. --- [All Turns] Effects can't trash [X Antibody] in this Digimon's digivolution cards.[When Attacking] This Digimon can digivolve into a Digimon card with [X Antibody] in its traits in your hand for its digivolution cost. [All Turns] Effects can't trash [X Antibody] in this Digimon's digivolution cards.[When Attacking] This Digimon can digivolve into a Digimon card with [X Antibody] in its traits in your hand for its digivolution cost.
X Antibody BT9-109 U X Antibody While you have a Digimon in play, you may use this card without meeting its color requirements. [Security] Gain 1 memory, and add this card to its owner's hand. [Main] Place this card under 1 of your Digimon without [X Antibody] or [link = X Antibody (Card Name)] in its digivolution cards as its bottom digivolution card. --- [All Turns] Effects can't trash [X Antibody] or [link = X Antibody (Card Name)] in this Digimon's digivolution cards. [When Attacking] This Digimon can digivolve into a Digimon card with the [X Antibody] trait in your hand by paying its digivolution cost.
X抗体 BT9-109 U X抗体 自分のデジモンがいる間、このカードは色条件を無視して使用できる。【セキュリティ】メモリー+1し、このカードを手札に加える。【メイン】このカードを進化元に「X抗体」がない自分のデジモン1体の進化元の下に置く。 --- 【お互いのターン】このデジモンの進化元の「X抗体」は効果で破棄できない。【アタック時】このデジモンを、手札の特徴に「X抗体」を持つデジモンカード1枚にコストを支払って進化できる。