omg!! I would go crazyyyyy if I had to keep track of over 5 credit cards, make sure to rotate them, and also make sure to use them 2-4x a YEAR..
I have 3, and I find these to be cumbersome in keeping track of when statement cuts and when to pay!
1. Citi Dividend MC -> most used card, daily Dunkin Donuts (they refuse to take amex)
2. Amex BlueCash -> sometimes big online purchases, mostly utilities and cell phone
3. Chase Amazon --> buying stuff from amazon.com (trust me, I am an addict!)
I *was* going to add Discover so it looks "prestine' on my CBR.. but I am way too picky and cant decide, so took our dear hauling's suggestion and waiting for a next card that comes out that SCREAMS my name =D