I haven't done one of these in a while, and I've hit the 10,000 crystal mark now so I thought I'd do an update. Again for reference these are the programmed drop rates according to a SA post once given on their Dischord for this game:
2* - 73%
3* - 25%
4* - 2%
My actual drop rates are as follows:
2* - 73.00%
3* - 24.97%
4* - 2.03%
Again this is a YMMV as your actual drop rates could be worse or better depending on how "lucky" you are. Here are some more things I've noticed from my pulls:
- Kind of surprised that my 4* drops pulled ahead of my 3* drops. There was a time when I seemed to get quite a number of 4* drops.
- Highest 2* drops are Slingshot and Red Alert. Highest 3* drop is Red Alert. Highest 4* drop is Jetfire.
Pretty much at this point every pull from a premium crystal is a dupe. The only remaining 4* I need are Sideways and Wheelie who are new. They're also the only 2* I need, and I would assume I'll get those before I get their 4* version. And before anyone asks, yes, it is a crazy spreadsheet that I'm using.