[Modern] Boros Prowess v2

[SethK]

Boros Prowess v2

making low mana cost creatures deal fatal damage through the combination of burn and aggro creatures

[Warden of Silence]

Hello.

So the only thing I can think of is the purpose of your Arid Mesa. Sure, it is a great card, but your deck doesn't really seem like it needs it. Unless you really just want to make sure you get the right color, I don't think it is worth it.

That is only a minor issue, however. Overall, I think your deck is quite good. Nice work.

[Juke]

I'd say, replace Arid Mesas with Clifftop Retreats, if you're struggling with paying specific mana colours you should run this dual land. If you don't get a certain land colour to play your one-drop, you could pay 2 life for that Sacred Foundry, then play an untapped Clifftop Retreat next turn, because a Sacred Foundry is both a Mountain and a Plains.
Other than that, seems like a solid deck.