Regarding Chrome Mox vs. Mox Diamond, that has been tried before. Post Ad Nauseam, they are more or less the same, but Chrome Mox is not only there to help making Ad Nauseams stronger, but also to power them out. Mox Diamond is much worse at this - after all, you have way more cards to pitch to Chrome than you have lands. Also, I don't actually think Chrome Mox is as bad as most other people do. Sure, it's worse than Petal, but Petal is just very, very good. I have actually had a second Chrome Mox in my sideboard for a while, but that was like two years ago.

I have also had Telemin Performance in my board when I was playing with Wishes. I had it in for about half a year and played about 18 matches of sanctioned Legacy during that time. I can only remember casting it twice in that entire time - and trust me, casting that card is something you will remember.