You could perhaps consider Pilfering Imp for your 1 drop slot. It comes in as a 1/1 flyer that can be cracked later for hand disruption when you want to make a strong play.

That's not a bad call at all, any thoughts on what to remove to add them in?

My initial thought on what to drop (regardless of what I'm adding) is probably Quarantine Field since it requires a lot of mana to really amplify (although I've had games where I've nabbed quite a few permanents with a Dark Ritual or two in there). I have so much other exile capacity though that it may be redundant (could sideboard them maybe).

I agree. I think that with as much hand disruption and removal spells in the deck, Quarantine Field may be unnecessary. You may also be able to reduce your deck of 1 land, given your low curve. That would open up 3 slots for the imp. You can try it that way and see how you like it. In my own deck, it has worked very well.

Not to mention, sacrificing it also triggers your Athreos and Teysa for added value

Excellent points. I think I'm going to give it a try, thanks for the input!