Aboshan, Cephalid Emperor is a perfectly fine typal commander
9 Mage Wars Arena Mage Wars Arena does what it says on the tin
you should pick a deck that speaks to you
If you dont want to look too hard for creatures that inherently have haste, this also isnt a problem, as you can simply give all of them haste with cards like Fervor, Concordant Crossroads, Rhythm of the Wild, or Fires of Yavimaya, making construction of a deck revolving around this card or Ogniss inclusion in a similarly aggressive deck quite manageable
The increase in supply should drive the price down a bit
While this can be used as a combo card (to do weird stuff in Changeling decks), its probably going to head to the 99 of your First Sliver deck, or command your swarm if youre just getting in