Surprisingly, decks built around Reyav can often outperform those built around Mirror-Shield Hoplite
It comes in at only two mana but can become a copy of any creature you own, assuming you exile it, so while they are only two mana, you generally want to wait to cast them until you have something big in play, like Massacre Wurm or Crabomination
It blends Blue's precision, red's passion, and White's order to create decks that thrive on noncreature spells, control, and synergy
However, Commander games can be pretty long and require a lot of planning to arrange and then a lot of effort to play, so cards destroy all lands in play like Armageddon, Devastation, and Ravages of War can be extremely frustrating to play against if no one can counter them