How I would design a 5* Featured Crystal
First of all, let me say that I know there is stickied thread. But it's mainly 45 pages of us arguing with each other (myself included). I wanted to create something constructive.
There are a couple of things that were good about the "old" featured crystal
1) Increased chance of duping a champ. We know 9/10 duped champs are better than unduped
2) Better chance of targeting a champ of in a class that you have resources for (T4CC, awakening gems) It can't be understated that many have expiring T4CC and awakening gems they simply cannot use on any champ.
3) Better chance of targeting a champ that will fill a hole in your roster (utility, prestige)
4) Better chance at getting a new and interesting champ
I can appreciate that the odds in the featured crystal were so inflated relative to other crystals that given enough shards you could almost tailor your roster and that was not the intent of the crystal.
These are the goals of "my" featured crystal
1) Access to featured/new champs
2) Increased chance at a class specific pull
3) Increased chances at particular champs by using a limited pool
4) High rotation so you don't get a "stale" crystal
5) Reduced chance of a "bad" champ
What follows it the design of the crystal
The crystal is made up of 18 champs.
6 x Featured champs: These are 2 champs released each month for the last 3 months.
6 x Class of the Moment: This contains 6 champs from Class of the Moment
6 x Curated Champs (one of each class): This contains 6 champs picked from Kabam's datamining of "effective" champs. (No champ is duplicated from the class of the moment pool).
So for any crystal pull your odds are:
6/18 for a featured
7/18 (or higher depending on the featured) of a specific class
6/18 (or higher depending on featured and class of the moment) of an "effective" champ
Each month 2 new featured champs are added to the crystal and the 2 oldest drop off.
I would like to see the other 12 champs rotate every 2 weeks, however, for consistency I can see them sticking with a one month rotation as well.
You could tweak this approach fairly easily to adjust the odds i.e. make the curated list 12 champs (2 of each class), but I feel this kind of approach offers scope for strategy and RNG to be balanced.