The Rod of Wonder has got to be the best magic item ever. It also helps one of my players will use one at any opportunity he gets. Oh, and a new chart would be fantastic!
Already wrote up a more serious wild magic surge table, with fey leanings for our campaign...
D100 Wild Magic Surge Effect ...
- have some of the options possibly affect caster or target or what I call SPIN (Some Poor Innocent Nearby) rather than just caster; and note this can include the opponents as well
- have a few opposite effects e.g. one of your entries is to have caster gain resistance to all damage for a minute; why not have a second entry where caster gains vulnerability to all damage for a minute (or half a minute, whatever)? These could be at 1% chance each rather than the one being at 2% chance.