Deflecting Palm is a good side for the mirror. Anger of the Gods or Scouring Sands would also kill the mirror

Yeah, I considered Deflecting Palm, but it's only for a single source of damage and the mirror is burn/wide creature boards. I may put in Anger of the Gods instead of End Hostilities, however Anger of the Gods only deals with creatures which are x/3 or less, where Arcbond combos well with either Seeker of the Way or Soulfire Grand Master to deal with any number/size of creatures, as does End Hostilities. The decision initially to not run mirror-focused sideboard cards is because while this type of deck is very common in the local meta, so is the Genesis Hydra + Temur Ascendancy + Temur Sabertooth combo decks, and I need to be able to answer for that. Arcbond completely wrecks them, cast it on Seeker of the Way then block their biggest creature, total board wipe, I gain a ton of life.

You need some one drops. You only have the Chained to the Rocks and the Collateral Damage, which you can only cast turn 2 and turn 3. Take out 1 Collateral Damage and two Seeker of the Way for three Monastery Swiftspear. You can not call it aggro when your first creature is on turn 2, and you only deal damage on 3. Taking my advice also helps your curve.

@Mgrabusky Yeah, I haven't had an opportunity to play test it yet, but I think you might be right. I'll definitely consider that and I already have the spare Monastery Swiftspear to put in, so it's something I'll definitely try if I get a chance to play test it this week.

@Mgrabusky after playtesting it, I think having some one drops is a good idea. I'm probably going to take Collateral Damage out altogether and put in two Monastery Swiftspear, possibly taking out one Seeker of the Way for the 3rd one. Other than that, it seems pretty well tuned and performed admirably. Didn't have to mulligan a single time, every hand is playable.