[Knight of Scape]

As I understand it, the question is basically about what happens if your opponent wasn't thinking about your OM removing power and just placed his OMs on a particular card in numerical order with the X last.

My personal feeling is that not letting the opponent shuffle the OMs in this scenario would be a pretty jerk move, since the only way it makes a difference is if you think that you can get a non-random OM (e.g. one that's not the X) by preventing your opponent from shuffling, in which case you're trying to go against the card's specification of a "random" OM.

On the other hand, if your opponent is keeping your OM removal power in mind when placing their OMs and shuffles their order at the start of the round, it seems like a waste of time to roll a die or make them shuffle again. Basically, if your opponent feels the need to shuffle the OMs to make your selection "random", and they express this before you've chosen an OM to remove, let them shuffle, otherwise, just pick an OM.

~KoS, noting that even in math it can be hard to use the word "random" unambiguously (technically a selection where there's a 99% chance of picking the leftmost OM is random, it just doesn't follow a uniform distribution)