Despite having a similar theme that screams synergy at first glance, a deck helmed by Archelos, Lagoon Mystic probably isn't the best home for Back to Basics because of the demanding color identity that will likely see you running a high number of nonbasic lands
The Hope of Ghirapur is a 1/1 Thopter artifact creature and costs only a single mana, allowing it to reliably be cast during the first turn of each game
Your opponent can only stop a Fling with a Counterspell effect, but in LoR, your opponent can use Doom Blade, Counterspell, Unsummon, and Diminish effects to downgrade your Atrocity into jaywalking
Limit Break has a few Soldier cards, but its not a tribal deck centered around Soldiers
Do you think this could make for some fun and different brews, or is it a flop in your mind