After taking the first couple weeks off this month, I decided to try a challenge of making masters with a deck using only commons and uncommons, and this deck exceeded my expectations. I have tracked 22 matches so far, going 14 wins and 8 losses, including quite a few bad matchups in there like Icaria Blue and Feln Control. Going through gold right now, and having played the game for over a year, these games are mostly against opponents with Tier 1 and 2 decks.
Gameplay is mostly straightforward, you want to have a 1 drop always so mulligan accordingly, and ideally curve out with Assembly Line to set up Rally turns and big Strength of Many. You should try to use Strength of Many on an unblocked unit if possible, especially if your opponent can't hold up removal. Burn Out is there for a bit of reach to help close out the game. Disassembler can make opponents blocks miserable, and it stacks in multiples of course to really pressure the life total.
If you are looking to upgrade the deck, this is a list VSarius developed, and I think it is actually really good right now, despite all the Hailstorm decks.
https://eternalwarcry.com/decks/details/69UYMsefK7g/rakano-rally
Will check it out today. Looks nice.
Keep it up