6 star shards
I play solo. The six stars have been out for 4 months? Already players are playing them and I have yet to see a shard 1. This is the same mistake you guys at kabam made with the fives. If you are smart you won't repeat it and you'll start seeding the lower tiers with some shards. Doesn't have to be enough to build one in short order. But even a solo player should have a shot at at least 1 six star champ in the space of a year...