This is my boros humans build. I basically dug up my old boros humans build from emn season and updated it with some new stuff.

Its undefeated so far, 6-0 Irc. It was a test build, but has been performing so well, I haven't changed anything yet.
Technically, its humans, a dwarf and a Spirit, but those are just details.
Cartouches have been surprisingly good so far. Trials too. Garrisons and Lone riders have been the all-stars.

Boros humans
Creature(20)
2 x Expedition Envoy
1 x Kytheon, Hero of Akros
2 x Selfless Spirit
2 x Glory-Bound Initiate
3 x Lone Rider
2 x Thalia's Lieutenant
3 x Honored Crop-Champion
2 x Sram, Senior Edificer
2 x Hanweir Garrison
1 x Thalia, Heretic Cathar

Sorcery(3)
2 x Declaration in Stone
1 x Collective Effort

Enchantment(10)
2 x Cartouche of Zeal
2 x Always Watching
1 x Trial of Solidarity
2 x Trial of Zeal
1 x Angelic Destiny
2 x Cartouche of Solidarity

Planeswalker(3)
1 x Gideon of the Trials
1 x Gideon, Ally of Zendikar
1 x Nahiri, the Harbinger

Artifact(2)
2 x Aethersphere Harvester

Land(22)
8 x Plains
5 x Mountain
2 x Needle Spires
1 x Stone Quarry
2 x Clifftop Retreat
2 x Hanweir Battlements
2 x Aether Hub

To view this deck go to: https://www.magicduelshelper.com/deckli ... c3d7c52e0c

Created using Magic Duels Helper: http://www.magicduelshelper.com

Enjoy!

Lone Rider has been an all-star? I'm surprised, considering that in my experience it's not easy to flip.

The deck still looks good to me. I'd try to fit in 2x Smuggler's Copter, probably dropping Nahiri and one of the enchantments.

With all the buffs, riders often flip themselves, other times glorybound and Harvester help out.

Nahiri has been good so far, plenty of enchantments to exile, not to mention tapped artifacts and creatures. Looting excess Land is also useful.

Copter was in, but didn't make the cut. Harvesters have more synergy.

In my version, I focus more on the exert/always watching synergy...so I play with the 3 hasty Minotaurs and 2 Glorybringers...even if they aren't human, they are good in themselves, and absurd with AW on the field...

Thing is, always Watching only shows up in roughly a third of my games, so I prefer to go with a more generic game-plan. Exert with always Watching or Trial of Solidarity is nuts though, that I've got to admit..

3x Flameblade Adept
2x Glory-Bound Initiate
2x Harsh Mentor
3x Bloodrage Brawler
3x Battlefield Scavenger
3x Honored Crop-Captain
2x Hanweir Garrison

2x Collective Effort
3x Fiery Temper

4x Cartouche of Solidarity
2x Cartouche of Zeal
2x Trial of Solidarity
2x Trial of Zeal
2x Always Watching

Gideon, Ally of Zendikar
Gideon of the Trials

23 Lands

I could switch up the creatures to focus more on Humans. Either that or focus more on exert creatures, which is broken with AW and Trial of Solidarity bouncing.

Blessed Alliance can flip Lone Rider, untap exerted creatures, and deal with annoying threats in races.

Also shocked to not see Devoted Crop-Mate. Better than Sram, imo.

I haven't been too impressed by the crop-mate. Looks just too fragile and its not really the 2-drops I'd like to get back, its more the 3-drops. Still, the obvious combo with Selfless Spirit isn't bad at all...
Bless alliance is an option, especially if I go more extert focused. Removal hasn't been bad so far and flipping the Rider hasn't been hard either.