In order for a boros commander to be strong it probably needs to fix one of the two problems with that combination that are the worst (difficult card draw, difficulty ramping).
A legendary Boreas Charger (1WR) would be very strong and yet not overpowering, and present multiple build options.
Other popular effects in those colors
* wheel
* gamble
* weathered wayfarer (RW Lands anyone??)
* mentor of the meek / Bygone bishop effects
* rituals (a commander that paid for its own mana cost on ETB or most of it might be strong)
* equipment tutoring
* cheap creature tutoring/reanimation
Using tax effects is just a good way to make the new commander very hated (see GAAIV).
Other very simple but strong options:
* Legendary RW Reveillark without Evoke that
* Legendary Bygone Bishop
* Legendary veteran motorist with something else instead of the vehicle rider
* Deepala but for humans
* Legendary RW Knollspine dragon but with vigilance or something
Tons of options. Just fix the mana or fix the card draw. Or both.
weirdly, adding a couple cool Boros commanders is the #1 reason I like the idea of PWs as commanders in some respects. Boros really gets the shaft on decent commanders.
A legendary Boreas Charger (1WR) would be very strong and yet not overpowering, and present multiple build options.
Other popular effects in those colors
* wheel
* gamble
* weathered wayfarer (RW Lands anyone??)
* mentor of the meek / Bygone bishop effects
* rituals (a commander that paid for its own mana cost on ETB or most of it might be strong)
* equipment tutoring
* cheap creature tutoring/reanimation
Using tax effects is just a good way to make the new commander very hated (see GAAIV).
Other very simple but strong options:
* Legendary RW Reveillark without Evoke that
* Legendary Bygone Bishop
* Legendary veteran motorist with something else instead of the vehicle rider
* Deepala but for humans
* Legendary RW Knollspine dragon but with vigilance or something
Tons of options. Just fix the mana or fix the card draw. Or both.
UW Ephara Hatebears [Primer], GB Gitrog Lands, BRU Inalla Combo-Control, URG Maelstrom Wanderer Landfall
UW Ephara Hatebears [Primer], GB Gitrog Lands, BRU Inalla Combo-Control, URG Maelstrom Wanderer Landfall