Following on from what people have said about the Ascension set being common, it does mean that I'm running Frozen Wasteland (Normal) with Ascensions on everything including ride along Eddies so getting 5 counts per run, which will go up to 6 when I've been through my Troopers. I haven't tested it but I would imagine that putting a normal Ascension set and an Ascension cosmic on the same character would count as 2, so you could in theory get 12 counts per run towards the 500 total, making it pretty quick.