Arena is the best mode, change my mind.

Solely for magic ability damage.

Nu Wa is pretty straightforward. These items also help survivability while still providing decent stats. But by default for Nu Wa: Use your 1st ability to close the gap and set up, or to cover yourself/allies and get away. Use your 2nd ability to either scout, be annoying, or, what you should always be doing, using it to set up your 3. Use your 3rd ability to hit as many of the clay dolls (your 2) as possible to stun and deal burst damage. Use your 4th ability to finish anyone off, to escape, to steal kills like the donkey you are, or to pull 1337 plays like scouting for Loki or someone with Helm of Darkness. Reminder metas are lame and for the squares that aren't tolerant to accept anything other than the meta. This is Arena, and a HiRez game at that. Do what you want.

They can never leave.

Don't like abilities? Want to simply hold left click, but are too cool to play a god that's designed to naturally be good at left clicking? I'm glad you want to be a handicap for your team, too. This build harps on Nu Wa's passive of rooting with her basic attacks, as well as the passive granted if you use her 3 or her Ultimate (4th ability). The "Final Build" to this route will look way different from the "Final Build" shown at the top for pure magic ability damage. Your abilities are secondary, meant only to close the gap (your 1) and to stun (the 2+3 abilities combo) to keep people in place to land more basic attacks. Your ult will be lacking, but is still a sub-par escape. Your abilities will of course not do much damage in general, in order to make sure Nu Wa left clicks people to death, or at least perma-roots one person. By using your 3 or Ultimate, your basic attacks are embued with additional neat effects. This is a decent way to throw people off; Nu Wa isn't meant to do this. But it's a great anti-ganker build, or a great way to do AoE left click damage. Worst case, you simply root one guy forever in every team fight, essentailly peeing in his Cheerios, assuming you can aim. I guess that's the worst case: you can't aim, you look stupid, get flamed, and do 8k Damage Dealt on the post-game summary. There's no shame doing what Nu Wa was meant to do: being a magic ability nuker.