The ebb and flow of interest surrounding new spoilers typically causes Commander-based price spikes to fade over time
Im certainly not going to argue that Legacy isnt too expensive, but the Reserved List isnt the major culprit here
Unless youve got ways to place +1/+1 counters on Creatures, youre enticed to cast the Vehicle side Jetfire, Air Guardian first, as a 3/4 flyer that can Adapt 3 to become a 6/7 Flying Creature Youre effectively paying 7 Mana to get that 6/7 Flying robot, but you do have the option of removing those +1/+1 counters for colourless Mana
As you can see, he is a 4/4 that can get flying, first strike, trample or rampage 3 during your upkeep until your next one
And a ton of commanders actually have enters-the-battlefield abilities (such as Godo, Bandit Warlord, Bladewing the Risen, Prime Speaker Zegana, or Venser, Shaper Savant)
Each card will be given a rating of 1-5