If your deck wants to play Divination, four is very likely the number you should be playing
But those are possibilities if you want them, be aware it will create a lot of additional interactions with your planeswalker, both ways to synergize with it, tutor it or cheat it into play and removal
Having access to such a potent growth effect in the command zone changes how life gain should be viewed in Commander
Some notable facts regarding Rooms: If a Room enters the battlefield without being cast both doors will start locked and neither ability will be active
There is no VMAX tag, no VSTAR suffix, and no ultra rare mechanic at play here
There are some great rooms to visit, but I'd be sure to visit Ebonlake Grotto for two faerie dragons, and the reward for venturing eight times is either an anthem/trample enabler, huge burn based on four cards' worth of mana value, or a one-sided board wipe