Hi, I have a similar deck, and first it look like yours.
I ended with this
http://elementscommunity.org/forum/index.php/topic,7130.msg84213#msg84213At first I used Otys, but then I see that if you have purple nymphs is better Mind Flasher than otys. Why? Because it is faster to play (two quanta against five) and don't kill the enemy so , you can antimatter, vampirize then, and it deals with the threads in a better way, it can quit momentum from geminis dragons, so you can antimatter them, it can stop growing creatures without having to reduce his HP with firestorms. It can deal with Flying Queen in a better way than a Oty, because a lobotimized Flying Queen is no dangerous anymore. With Oty, you have to play Oty and reduce the HP of Flying Queen, it is slower. Also against Osiris is better, because is faster to lobotomize his Pharaoh. The same for Osiris. And against Morte and Incarnate, you can stop his retrovirus, without letting him to create an army of skeletons because you don't have to kill his creatures. Against Scorpio it can stop physalias and fishes and oty is venomized if does. Also against goods with rays of light, lobotomize them, means they can't play miracle, game is faster.
Another advantatge is that you have this creature to rewind, and also you can play butterflie effect on it.
The only goods that with Oty and Purple Nymph is better combination is Ferox, but you are going to win anyway with Oty or without it, and Hermes, and it is a difficult god with Mind Flasher, but anyway with purple nymph based deck is a god that you are going to lose most of games.
I have added a lot of thinks to stall, to make time to play the nymps and play it.
The suggestion of Unionruler are very good, I first tried with entropy version, it is faster but it is less consistant an ended with a time version with hourglasses.