What does the X Potion do?
Solution 1:
It just changes your name to Player , it's pretty pointless actually.
There is no leaderboard system involved with the numbers.
Solution 2:
Perhaps it just means you are the 346th player to make Potion X, I myself am Player 210 from making Potion X.
I have yet to figure out what this number actually means, but for all we know its a ranking for a leaderboard of some sort.