The fact that it's Accelerating the deck instead of discarding off the top is only relevant when combining Adversaries and the top Invader Card (post-Explore) is a later Invader Stage moved upwards by Adversary instructions. (Eg: Brandenburg-Prussia 5, where it will be a Stage III card, but there are still Stage II cards left in the deck.)
Tags: Accelerate, Combining Adversaries, Timing, Kingdom of Sweden, 0 more...