Nythos from what I've heard is mostly used to chain draw a bunch of 1 cost creatures/spells in Card Draw Magic which is probably the best use of it. Trying to tutor a spell using Leyhoard is cute, I don't see it working well, trying to have 6 cards in hand to play a 4 cost Leyhoard and have Nythos to draw a Wyrmbreath is cumbersome.
Yep I agree. However, I did play with a deck with a ton of 1-drop spells and a single deuteria. Was fun. I could also see him auto-drawing card sharks for a school teacher deck.