Rulings
Q1: We have a situation where there are two face-up security cards. If this card's On Play When Digivolving effect is activated, does it De-Digivolve 2?
No, not De-Digivolve 2, but De-Digivolve 1 twice. ≪When De-Digivolve 2 is performed, the two cards stacked on top of each other are treated as if they were discarded at the same time, but when De-Digivolve 1 is performed twice, the cards stacked on top of each other are discarded one by one. For example, when two cards are discarded from the top of a Digimon in the rest state by De-Digivolve 2, the effect of the second card to be discarded, "BT15-047 Kabuterimon", is not activated, but if you play De-Digivolve 1 twice, after the first card is discarded by De-Digivolve 1, that Digimon will become "BT15-047 Kabuterimon", it will not be affected by the second De-Digivolve 1 and therefore will not be trashed.
Data Sources
Lv.5 CannonBeemon BT18-052 U Ultimate | Virus | Cyborg/X Antibody/Royal Base [Digivolve] Lv.4 w/[Royal Base] trait: Cost 3 [Security] [Opponent's Turn] All of your [Royal Base] trait Digimon gain <Blocker>. [On Play] [When Digivolving] For each of your face-up security cards, <De-Digivolve 1> 1 of your opponent's Digimon. (Rule) Trait: Has [Insectoid] Type. --- Inherited: [All Turns] [Once Per Turn] When this Digimon deletes your opponent's Digimon in battle, trash their top security card.
Lv.5 CannonBeemon BT18-052 U Ultimate | Virus | Cyborg/X Antibody/Royal Base [Digivolve] Lv.4 w/[Royal Base] trait: Cost 3 [Security] [Opponent's Turn] All of your [Royal Base] trait Digimon gain <Blocker>. [On Play] [When Digivolving] For each of your face-up security cards, <De-Digivolve 1> 1 of your opponent's Digimon. (Rule) Trait: Has [Insectoid] Type. --- Inherited: [All Turns] [Once Per Turn] When this Digimon deletes your opponent's Digimon in battle, trash their top security card.
Lv.5 CannonBeemon BT18-052 U Ultimate | Virus | Cyborg/X Antibody/Royal Base [Digivolve] Lv.4 w/[Royal Base] trait: Cost 3 (Security) [Opponent's Turn] All of your [Royal Base] trait Digimon gain <Blocker>. [On Play] [When Digivolving] For each of your face up security cards, <De-Digivolve 1> 1 of your opponent's Digimon. (Rule) Trait: Has [Insectoid] type. --- Inherited: [All Turns] [Once Per Turn] When this Digimon deletes your opponent's Digimon in battle, trash their top security card.
Lv.5 キャノンビーモン BT18-052 U 完全体 | ウィルス種 | サイボーグ型/X抗体/ローヤルベース 特徴に「ローヤルベース」を持つLv.4:コスト3 [セキュリティ]【相手のターン】特徴に「ローヤルベース」を持つ自分のデジモン全ては≪ブロッカー≫を得る。 【登場時】【進化時】相手のデジモン1体を自分の表向きのセキュリティ1枚ごとに、≪退化1≫。 〈ルール〉特徴:タイプ「昆虫型」を持つ。 --- Inherited: 【お互いのターン】[ターンに1回]このデジモンがバトルで相手のデジモンを消滅させたとき、相手のセキュリティを上から1枚破棄する。