14 Lathliss, Dragon Queen Lathliss, Dragon Queen is the first mono-color Dragon on our list
Aside from synergizing with its Commander deck's featured commander card, it can also work with other commanders counting +1/+1 counters, such as Animar, Soul of Elements
I think Id go with the other Beckett Brass, given the choice
Lutri, the Spellchaser was controversially (and correctly, in my opinion) banned from Commander on release as itd otherwise be an auto-include in any deck playing blue and red (almost any Commander deck fulfills the companion restriction, as this was clearly not designed for Commander)
You can: Make two 1/1 Soldier tokens with haste tapped and attacking Draw a card and lose a life Have Caesar deal damage equal to the number of creature tokens you control to a player