Q1: What order do an effect that triggers when a card is removed from a security stack and a Security effect on a checked card activate when they trigger simultaneously upon a security check?
The Security effect will activate first. Upon a security check, a Security effect will immediately activate without pending activation.
Lv.4 Dimetromon BT21-017 U Champion | Virus | Reptile/LIBERATOR [When Digivolving] If you have 1 or fewer Tamers, you may play 1 [Owen Dreadnought] from your hand without paying the cost. --- Inherited: [Your Turn] [Once Per Turn] When your opponent's security stack is removed from, gain 1 memory.
Lv.4 Dimetromon BT21-017 U Champion | Virus | Reptile/LIBERATOR [When Digivolving] If you have 1 or fewer Tamers, you may play 1 [Owen Dreadnought] from your hand without paying the cost. --- Inherited: [Your Turn] [Once Per Turn] When your opponent's security stack is removed from, gain 1 memory.
Lv.4 Dimetromon BT21-017 U Champion | Virus | Reptile/LIBERATOR [When Digivolving] If you have 1 or fewer Tamers, you may play 1 [Owen Dreadnought] from your hand without paying the cost. --- Inherited: [Your Turn] {{OncePerTurn}} When your opponent's security stack is removed from, gain 1 memory.