I would suggest using Glory of Warfare instead of Agrus Kos, Wojek Veteran . It's faster, and harder to destroy. I also don't think that Aurelia, the Warleader and Gisela, Blade of Goldnight are good here, since they're too much hard to cast. Instead of them, you could play Hellrider or Hero of Oxid Ridge (which can be very nice against tokens) to buff your attackers. Good Luck!

+1 because Hero of Oxid Ridge

Oh Yea +1 for [Hero of Oxid Ridge] I miss using that guy.

you could also use Hero of Bladehold to pump out more creatures to be buffed with Glory of Warfare .

I think u should add Aurelia and some Boros angels for fliers. and Assemble the Legion for some extra fun

Elite Vanguard can be replaced by the theros rare whtyamerceollit

I recommend Honor of the Pure , as it would boost almost every creature here. If you are worried about all creatures, then Glorious Anthem .

I don't think Wojek Halberdiers cuts it here. You could take them out for Soldier of the Pantheon or something.
Silverblade Paladin is brutal when followed by a paired Hero of Oxid Ridge .
Last thing... Swords to Plowshares is not in Modern. Try Path to Exile instead.
+1, we all love Hero of Oxid Ridge .

Why is Wojek Halberdiers in here there are so many more 2 drops that are better like Grand Abolisher

Why not Mirran Crusader

or Hero of Bladehold

One last one what about Honor of the Pure

You guys should check out my Modern Boros Deck Unstoppable Boros

Gather the Townsfolk , maybe Increasing Devotion , Doomed Traveler , and possibly Loyal Cathar  ^Flip might be pretty good here. And Lingering Souls if you're willing to splash black. That would work pretty well.

Looks like a good deck I'm personally a fan of Glory of Warfare . Never had a chance to really abuse it, though.

twospires dont suggest half of my black white human modern deck D:

OXID RIDGE GONE!?!?!?!?!? mesah sad T_T

lol you have one? That's hilarious. Great minds think alike, huh? What about Hellraiser Goblin , Stormblood Berserker , or Boros Swiftblade ?

no to hellraiser, it literally makes u lost games and makes ur enchantment obsolete maybe stormblood and maybe swiftblade, depends on how it playtests

Oh, sorry, I thought hellraiser made it hard to block. I meant something more like Pyreheart Wolf . My bad. Oh oh oh, what about Assemble the Legion ? That's a fun one.

with so many humans Champion of the Parish

Also, Scourge of the Nobilis is amazing on swiftblade

Sorry for triple post, ideas come to me in bursts. Mentor of the meek will not work with Glory of warfare, because the creatures will enter with the two extra power.

What about Purphoros, God of the Forge or Hellrider instead of the two angels? This kinda goes in contrast with deck name though

Do you have any ramp for Gisela and Aurelia?

maybe look in the deck? he only has Path to Exile if he wanted to exile his own creature and then put a basic land on the battlefield tapped.