This really depends on your product goal, are you trying to make the whole game of Buzzerbeater accessible through an app, or are you trying to make a successful app that represents Buzzerbeater? If it's the former, the MVP would need a lot of things in order to make it work with the browser version. If it's the latter, you have much more freedom if you make it stand-alone, and you can keep it much smaller (meaning much less time-to-market, less risk etc).
In my opinion I think it's best to start as small as possible to get real feedback on your app as soon as possible (instead of just wishlists and great ideas that don't fit your product goal).
As a first testable version, I'd say you'd need the be able to offer the following experience:
1. Prepare for and play a game - this is the core of the game
- Have a roster of players with skills
- Analyse your opponent in some way
- Set a lineup and tactics
- See the results
2. Develop your roster - this is what people like, see what you can include
- Improve a player
- Draft a player
- Add a player
I think all else is just extra and can be added after the first release to keep things as simple as possible.
Things I'd leave out of the MVP
- Transfer list/player market (maybe another way to acquire players, but not via bids)
- Staff purchasing through bids