If youre worried about build time (which is usually about 50 minutes), you can mitigate time anxieties by having a baseline done early (i.e., I know Im playing UB because I have Edgar, Sephiroth, Odin, and Ultimecia, Time Sorceress, but should I splash red for anything?)
Recruiter of the Guard Small creatures are whites bread and butter, which gives Recruiter of the Guard no shortage of powerful targets to find, including Esper Sentinel, Mother of Runes, and Stoneforge Mystic
We have a lot of the main tribes in these colours that work including goblins, saprolings, zombies, vampires, and I am sure many more
I definitely think that this set brings a lot of interesting cards to the game and I can tell that this was a labor of love from the folks at Wizards of the Coast who worked on the set