For Urza's Legacy design (the team being myself, Henry Stern and Mike Elliott as the lead), we went hog-wild
So long as players keep their decks down to a reasonable size, manage the costs of their cards, and have plenty of cards to add to the Inkwell, their decks should be relatively well-balanced
By their nature, cuts will vary on what direction you take the deck, and who you are playing with, so these are just a few ideas of cards I think you can cut: Whirler Rogue Hornet Queen Search the Premises Selvala, Explorer Returned Innocuous Researcher Serene Sleuth Finale of Revelation Ransom Note Teferis Ageless Insight Knowledge is Power These aren't necessarily bad cards, but ones you might upgrade on with some of the other options, or may move from on if you take the deck in certain directions
Craterhoof Behemoth Craterhoof Behemoth is back, although its impact on a format like Standard remains to be seen