The Knight is likely better, as First Strike tends to be superior to Vigilance in aggressive decks, and it puts the (not necessarily Basic) Plains onto the battlefield un tapped
As with the other Commander Decks, there are two options for Commanders: Kotis, Sibsig Champion and Teval, the Balanced Scale
In a format where most people want access to as many colors as possible to sure up any weaknesses, as such this card can blunt assaults on the back of black creatures cannot attack you and act as a momentary [casthaven]Ghostly Prison[/casthaven] for any other attackers
It is much slower than Bazaar, but balances that with being card advantage neutral (unlike the card disadvantage of Bazaar)
Lastly, the introduction of an all-new, extremely rare, rarity provides high-end collector's chase cards while still having non-chase version for competitive players to still obtain
Collect and display legendary scenes like Bahamut's destruction of Alexandria with incredible visual detail