You could go infinite if you added Tezzeret the Seeker . Not sure if you want that, but its something to keep in mind.

I don't think Tezzeret the Seeker solves the problem. The problem is that untapping lands to continue being able to use The Chain Veil is the -1 ability of Teferi. While I have managed to use my planeswalkers almost 10 times in a single turn once with the help of Contagion Engine and two permanents that tap for two mana, unless I'm missing something major, I don't think infinite is possible with these colors of planeswalkers. Unless someone can prove me otherwise, which I'd love to see. I really want it to be possible in this deck.

If you want a wall of nope Dream Tides works pretty well.

Dream Tides hurts me too though. It would keep my creature Narset tapped down. That would lock down more mana that I could no longer use, and both mana and creature Narset are very crucial resources to this deck. I like the card, just not for this deck. Thanks though!