After looking more at the spoilers, the only card I like from the main set (for any of my existing decks) is
Cemetery Tampering. It has the look of a card I would try to make a pet card and force into a deck like Sidisi but I'm not sure the impact it would have would be worth it. I really don't have that many cards that would value from being cheated in with the Hideaway mechanic in that deck.
Looking at the Commander cards,
Writ of Return looks interesting but I think the mana cost is too high.
Life Insurance is an interesting card for Varina but I really don't know what I would take out for that CMC to slot it in.