You'll have to think about the people who will play your game if you're going to design the best game possible for those kinds of people
Both new forms of Item lock have their drawbacks
Walk-In Closet/Forgotten Cellar Half Crucible of Worlds, half fixed Yawgmoth's Will, this Room certainly has a pedigree
Play the cards that bring you joy, not the ones which might be considered objectively best. Runner-Up: Tamiyo, the Moon Sage Black Crypt Rats, a Visions classic, found a reprint in Seventh Edition and Modern Horizons, but has been mostly missing across the years
On her own account, she can generate a respectable two lore each turn
For now, however, its hard to deny the innovation on display here