Rulings
Q1: If I have exactly 3 cards in my security stack, do I activate both "suspend 1 Digimon, and 1 of your Digimon gets +3000 DP until the end of your opponent's turn" and the "return 1 of your opponent's suspended Digimon to the bottom of the deck" effect when activating this card's On Play When Digivolving effect?
Yes, that's correct.
Q2: Does this card's All Turns effect prevent Security effects on my opponent's Security Digimon from affecting this Digimon while it's suspended?
Yes, it isn't affected. Security effects on Security Digimon are treated as Digimon effects, so the "this Digimon isn't affected by the effects of your opponent's Digimon" effect prevents such effects from affecting this Digimon.
Q3: If this Digimon is affected by a "can't unsuspend" effect from an opponent's Digimon, does it unsuspend during my unsuspend phase?
Yes, it unsuspends. After it suspends, it's no longer affected by your opponent's effects, so it can now unsuspend.
Data Sources
Lv.6 Shivamon ACE LM-024 P Mega | Data | Insectoid [Digivolve] Lv.5 w/[Pulsemon] in text: Cost 3 [Hand] [Counter] <Blast Digivolve> (Your Digimon may digivolve into this card without paying the cost.) [On Play] [When Digivolving] If you have 3 or more security cards, suspend 1 Digimon, and 1 of your Digimon gets +3000 DP until the end of your opponent's turn. If you have 3 or fewer, return 1 of your opponent's suspended Digimon to the bottom of the deck. [All Turns] While this Digimon is suspended, it isn't affected by your opponent's Digimon's effects. --- Inherited: <Overflow (-4)> (As this card moves from the field or under a card to an area other than those, lose 4 memory.)
Lv.6 Shivamon ACE LM-024 P Mega | Data | Insectoid [Digivolve] Lv.5 w/[Pulsemon] in text: Cost 3 [Hand] [Counter] <Blast Digivolve> (One of your Digimon may digivolve into this card without paying the cost.) [On Play] [When Digivolving] If you have 3 or more security cards, suspend 1 Digimon, and 1 of your Digimon gets +3000 DP until the end of your opponent's turn. If you have 3 or fewer security cards, return 1 of your opponent's suspended Digimon to the bottom of the deck. [All Turns] While this Digimon is suspended, this Digimon isn't affected by the effects of your opponent's Digimon. --- Inherited: <Overflow (-4)> (When this card would move from the battle area or under a card to another area, lose 4 memory.)
Lv.6 Shivamon ACE LM-024 P Mega | Data | Insectoid [Digivolve] Lv.5 w/[Pulsemon] in text: Cost 3 [Hand] [Counter] <Blast Digivolve> (One of your Digimon may digivolve into this card without paying the cost.) [On Play] [When Digivolving] If you have 3 or more security cards, suspend 1 Digimon, and 1 of your Digimon gets +3000 DP until the end of your opponent's turn. If you have 3 or fewer security cards, return 1 of your opponent's suspended Digimon to the bottom of the deck. [All Turns] While this Digimon is suspended, it isn't affected by the effects of your opponent's Digimon. --- Inherited: <Overflow (-4)> (As this card moves from the battle area or under a card to another area, lose 4 memory.)
Lv.6 シーヴァモンACE LM-024 P 究極体 | データ種 | 昆虫型 「パルスモン」の記述があるLv.5:コスト3 ［手札］【カウンター】≪ブラスト進化≫（自分のデジモンをこのカードにコストを支払わずに進化できる） 【登場時】【進化時】自分のセキュリティが3枚以上なら、デジモン1体をレストさせ、相手のターン終了まで、自分のデジモン1体をDP+3000。自分のセキュリティが3枚以下なら、レスト状態の相手のデジモン1体をデッキの下に戻す。 【お互いのターン】このデジモンがレスト状態の間、このデジモンは相手のデジモンの効果を受けない。 --- Inherited: （バトルエリアかカードの下から、それ以外の場所に送られる場合、メモリー-4）