To use the bot just add him and use the following commands (STARTING 03.06.2017)

!help - see how the bot works
!level [level you want to reach] - how many sets you need for the level you want to reach
!check - check how many sets you can buy in total (The amount of sets the bot owns of which you have not crafted a level 5 badge yet.)
!check [amount of keys] - how many sets you can buy for a specific amount of keys
!buy [amount of keys] - buy sets you haven't crafted for a specific amount of keys
!buyany [amount of keys] - buy random sets for a specific amount of keys