I'm just starting to play IA and have been playing X-Wing for awhile. In X-Wing to play in tournaments all you need is the core set and whatever ships and upgrade cards make up your list. I'm beginning to suspect that IA will not be the same with skirmish mission cards and new map tiles spread across different expansions.
Am I totally off here? Will I be unable to play at tournaments if I don't keep up with expansions?