I don't think it's because Wizards were using it exactly
Liliana #15 Rulings for Rancor 1 2018-03-16 If the creature this Aura would enchant is an illegal target by the time Rancor tries to resolve, the Aura spell doesn't resolve
Archived from the original on November 25, 2020
Low-cost utility creatures like this are foundational for aggressive strategies, particularly when supporting top-tier vampire commanders in MTG that rely on early board presence and consistent resource flow
I also wouldn't be playing Desert in a deck with so many color requirements, it could probably be replaced with another snow land
Yawgmoth, Thran Physician Another mono-black commander makes the cut you're less likely to see Yawgmoth, Thran Physician than Braids, Arisen Nightmare in the command zone, but the Father of Machines is a lot stranger in formats like Modern