Q1: What cards can be placed as the bottom security card by this card's On Play When Digivolving effect?
A yellow Option card with a cost of 5 or less or a purple Option card with a cost of 5 or less.
Q3: If Wizardmon or X Antibody is in digivolution cards, can I use this card’s On Play When Digivolving effect to place a yellow or purple Option card with a cost of 5 or less from my hand as the bottom security card even when I can't add my top security card to the hand?
Yes, you can.
Lv.4 Wizardmon (X Antibody) BT19-036 U Champion | Data | Wizard/X Antibody/Witchelny [Digivolve] [Wizardmon]: Cost 0 [On Play] [When Digivolving] Add your top security card to the hand. Then, if [Wizardmon] or [X Antibody] is in this Digimon's digivolution cards, you may place 1 use cost 5 or lower yellow or purple Option card from your hand as the bottom security card. --- Inherited: [All Turns] [Once Per Turn] When this yellow Digimon with the [Data] or [Witchelny] trait would leave the battle area by your opponent's effects, by trashing your top security card, it doesn't leave.
Lv.4 Wizardmon (X Antibody) BT19-036 U Champion | Data | Wizard/X Antibody/Witchelny [Digivolve] [Wizardmon]: Cost 0 [On Play] [When Digivolving] Add your top security card to the hand. Then, if [Wizardmon] or [X Antibody] is in this Digimon's digivolution cards, you may place 1 use cost 5 or lower yellow or purple Option card from your hand as the bottom security card. --- Inherited: [All Turns] [Once Per Turn] When this yellow Digimon with the [Data] or [Witchelny] trait would leave the battle area by your opponent's effects, by trashing your top security card, it doesn't leave.
Lv.4 Wizardmon (X Antibody) BT19-036 U Champion | Data | Wizard/X Antibody/Witchelny [Digivolve] [Wizardmon]: Cost 0 [On Play] [When Digivolving] Add your top security card to the hand. Then, if [Wizardmon] or [X Antibody] is in this Digimon's digivolution cards, you may place 1 {{Colour|yellow}} or {{Colour|purple}} Option card with cost of 5 or less from your hand as your bottom security card. --- Inherited: [All Turns] [Once Per Turn] When this {{Colour|yellow}} Digimon with the [Data] or [Witchelny] trait would leave the battle area by your opponent's effects, by trashing your top security card, it doesn't leave.
Lv.4 ウィザーモンX抗体 BT19-036 U 成熟期 | データ種 | 魔人型/X抗体/ウィッチェルニー 「ウィザーモン」:コスト0 【登場時】【進化時】自分のセキュリティを上から1枚手札に加える。その後、このデジモンの進化元に「ウィザーモン」/「X抗体」があるなら、自分の手札から、黄/紫の使用コスト5以下のオプションカード1枚をセキュリティの下に置ける。 --- Inherited: 【お互いのターン】[ターンに1回]特徴に「データ種」/「ウィッチェルニー」を持つ黄のこのデジモンが相手の効果でバトルエリアを離れるとき、自分のセキュリティを上から1枚破棄することで、離れない。