The "Evolve Rules" Table

Hidden in a secret cobweb-filled vault under TSR's former Lake Geneva headquarters we found a curious stone tablet of eldritch origin that had been laboriously inscribed with the following:

To produce a new edition of the rules, start with the current edition, roll on this table 3 times (re-rolling duplicates), and find new artists.

d8	Change
1	Add a new playable race, roll on any of the current edition's random encounter table for race.
2	Remove a playable race without explanation OR re-roll level limits for each class using 2d6+2.
3	Change monster hit dice from d6 to d8, d8 to d10, d10 to d6 as compared with the current edition.
4	Add or remove specialist magic-users, depending on whether or not the current edition has them.
5	Change how rangers pick their favored enemy; if there currently are no rangers, introduce them.
6	Roll d6: 1-3 combat is Theatre of the Mind; 4-5 combat is on square grids; 6 combat is on hex grids.
7	Number of books/boxed sets to spread new edition rules out over: 3d20-2, reroll 1s.
8	Add only 0.5 to edition, not 1.

Apparently an (incomplete!) copy of the tablet was made by certain WotC delvers when they first explored the ruins of TSR after acquiring a deed to their holdings. It's unclear what mistakes they made in their transcription, but they must have made some...