So if your Commander is Red and White, then you cannot have any Blue, Black, or Green cards in your deck (and the rules also dont let you cheat and use colored abilities either)
In this case, hes become a dashing knight complete with armor and a two-handed claymore so big it would make Cloud Strife jealous which certainly accounts for his immense power level
Illustrated by Irina Nordsol
So it wouldn't be that big of a surprise for there to be a functional deck in Standard that could play Zirda as its companion, although I'm not sure just how good Zirda would be in such a deck
Arco-Flagellant, Vanguard Suppressor, Zephyrim, Ultramarines Honour Guard, Space Marine Devastator, and Sicarian Infiltrator are all going to be big plays in the deck, thanks to how many copies of themselves they can create