Two of my three wishes:
The ability to have or not have, at will, any combination of all the skills, abilities, powers, attributes, inventory, equipment, weapons and knowledge I've ever had in any game or in real life in any game or in real life.
The ability to shape-shift freely without adverse effects.
...
What else would be good? Fleshcrafting! How to annoy all those proponents of female genital mutilation: FIX THE GIRLS! Also good for helping girls who had acid thrown in their faces after they tried to get out of marrying someone 50 years older, burns victims, bottle victims, RTA victims, amputees of all kinds ...
Epic plant manipulation skills come free with the first wish above, but even alone they'd be impressive. Deforestation a problem? You want a forest there, like the one over there? Area-of-effect animate plant. Forest: forward march! Forest: halt! There. Forest, right where you ... what? Oh, that area too? Erm ... okay ... *EPIC*PLANT*GROWTH*! There you go, forests in both places. Happy? Yes? Good! Want more? Okay! *EPIC*PLANT*GROWTH*! There, more forest. ... heh ... er ... was ... anyone, er, using that Rio de Janeiro? Oops. Heh. Sorry. Oh well, forest! Look! Treeeeees! Be happy.