I just want to make sure you know, because if you play with friends in a more casual setting this might upset them, but having
Teferi's Puzzle Box and Narset, Parset of Veils out at the same time will cause them to never draw anything. That first card they draw on their draw step gets immediately put on the bottom of their library, unless it's an instant or something with
flash and they can play it, and then they don't draw anymore because of Narset. It has ways to be dealt with, but you'll put a huge red target on yourself with that combo.