Tried to keep the cards from within BFZ -> HOD standard. That said, I think I want to add Yorion as a companion if I can find a copy. Maybe because it's a blink deck. Maybe because I struggled to cut to 60 cards and decided to make it an 80 card deck.

If the deck is too painfully slow for opponents, more tutors could help finish things off. But if Panharmonicon and a card draw permanent are out, it should be possible to pick up the entire deck and kill with Manic Scribe or Walking Ballista.

There are plenty of other things that could be added if more sets were permitted - e.g. Momentary Blink, Mistmeadow Witch, Eldrazi Displacer (could be included anyway?), dual lands and fetches...