Well, I must say at first that you SHOULDN'T upgrade your nymphs if you want to take part in PvP events, since the difference is not that much and most events are for unupped cards...
That said, you have a bit too many bone pillars and you may be short on darkness quanta... Also having a deck bigger than 40 cards makes it tenant to bad draws
Is this deck the one you want to use? If you don't have the nymphs, it may take even years to get them... You'll also need the weapons, so you must grind Top50 to get them...
For AI3 you need consistence and lots of creatures and pillars/pendulums, so I recommend you a deck like this:
52g 52g 52g 52g 52g 52g 52g 52g 52g 52g 52g 52g 52g 52g 52h 52h 52h 52h 52o 52o 52o 52o 52o 52o 52t 52t 52t 52t 52t 52t
that's the best unupped AI3 grinder, and one of the cheapest...
or this one, made by myself
:
52g 52n 52n 52o 52o 52o 52p 5uk 5uk 5uk 5uk 5uk 5uk 5un 5un 5un 5un 5un 5un 5uo 5uo 5up 5up 5uq 5uq 606 606 606 606 606 606
It's sooo newb deck, but you could try it if you mind, if not you could take a look at the duo-trio decks board and search for "darkness death" in the top right of the page
As you can see, 30-cards tend to give you the cards you need, specially if you have more than one of each