Ok, so a strange thing happened during tonight's game. We played the Secret Wars scheme , and we had at one time those 4 masterminds required by the scheme in play. King Hyperion, Stryfe, Zombie Green Goblin and Uru-Enchanted Iron Man. Both Stryfe and Uru-Enchanted Iron Man require stacking Master Strikes next to them. We still aren't sure if this is correct, but we stacked those Master Strikes only under Stryfe, so that Iron-man won't get any additional Uru-enchanted weapons. The question that I have is the following: did we play it right? Can one choose to which mastermind the Strike goes, or should we imagine that it stacks next to both? I'm leaning towards the first, but I wanted to make sure so that the next time this happens I won't be in such a dilemma again.
Another way to look at it is that when you have multiple Masterminds, the player whose turn it is decides what order they happen in. So wouldn't the first Mastermind who calls for the card to be used a certain way take priority?