Solphim, Mayhem Dominus is probably the worst in the cycle, mainly because it only doubles non-combat damage
1 2 3 4 5 "Magic: The Gathering's most popular Commander has been banned"
Each booster contains two cards from the Retro Artifacts bonus sheet, which comes with vintage artifacts in old frames, and you have a small chance (less than 1%) of finding a serialized schematic for staples like Mox Amber or Wurmcoil Engine
It is rare for a deck to use only one color
You have so many different creatures at your disposal, and most will come with some sort of mechanics attached, such as Reach, Vigilance, Deathtouch, Menace, or Trample, while others are token generators
Outside of a solid reprint of Exquisite BloodExquisite Blood and the new all-star Charismatic ConquerorCharismatic Conqueror, theres not much here to justify buying the whole deck