Boutmon (BT17-036) - Secret Crisis

[[Digivolve] Lv.4 w/[Pulsemon] in text: Cost 3]
[All Turns] [Once Per Turn] When this Digimon would leave the battle area by an opponent's effect, by trashing the top card of your security stack, prevent it from leaving.
[All Turns] [Once Per Turn] When an effect trashes from your security stack, this Digimon with [Leon Alexander] in its digivolution cards may digivolve into a Digimon card with [Pulsemon] in its text in the hand without paying the cost.

[End of Attack] [Once Per Turn] If this Digimon has [Pulsemon] in its text, by trashing the top card of your security stack, unsuspend this Digimon.