The requirement of eight different names among unlocked doors translates to just four fully unlocked Room cards, which is a lot more attainable than it might first appear
Imagine playing something like Apex Devastator or Ulamog, the Ceaseless Hunger on turn five
Then, in the afternoon, Wizards previewed two additional cards on Weekly MTG, Kaalia of the Vast and Mana Crypt, and confirmed that there are multiple zero-mana artifacts in the set
Same if you have some Hero cards from previous sets, they should be great to include, and represent an immediate upgrade
Example Berta Decklist here: Berta, Wise Explorator Increment Mega Ramp Blech, Loafing Pest Blech is quite literally the best boy, and thankfully, he also happens to be a really fun commander