Board Thread:Game Discussion/@comment-5573466-20130505204212/@comment-9012150-20130507134451

I noticed that my Slipstream would gain 3 or 4 levels during the event when I upgraded it. This morning it gained 1. I thought it was just because the card was over level 50, so it would naturally take more exp to level than when it was lvl 1 or 16.