Plow is the more direct card and more powerful in the right situation however the right situation for Command occurs far more often than it does for Plow
Vnwxt, Verbose Host One of card draw's best payoffs is a replacement effect
While these two abilities pair well together, even if Ukkima was removed, it deals an amount of damage to a player equal to its power, making it incredibly inconvenient to deal with
Commander is a relative newcomer in terms of Magic the Gathering formats but it stands as one of the most popular
Mind that neither player receives priority when casting or resolving a spell, as well as activating or resolving an ability
A few managed to make the list, but I'd like to offer a look into a couple more that you could use to fill out a mon-Red Dragons build with either Inferno of Stars Mounts or Ilharg, the Raze-Boar as the masters of these beasts