This do be my first draft of Quintorius, Field Historian, who I discovered has a lot more to him than first meets the eye. I reckon there's a viable build using our friendly neighborhood elephant to helm any of the following: Astral Drift/Slide.dec cycling, blink, all-in artifact recycling a la Daretti, Scrap Savant, spellslinger with a heavy flashback theme, storm, creature combo, aristocrats, etc. I took some elements of what I felt where the strongest synergies in a couple of those themes and smushed them together into this list, which is primarily a token swarm strategy.
There are a couple of ways the deck wins. First and foremost, combat. There's lots of ways to cast/sac/recur cheapo stuff and efficiently pump out 3/2s (psych! they're 4/2s, let's be real) and then beat down once they are buffed up with stuff like Tears of Rage, Akroma's Will, and Shared Animosity.
If straightforward, fair magic fails, there are a couple of ways to combo out. Underworld Breach is the easiest, no surprise there. Escaping Goblin Lore and alternating in a Battle Hymn or Mana Geyser every few casts can produce an absurd number of spirits and mana, which can then be used to do something silly like pass around Quintorius's boots for Lorehold Apprentice tappy shenanigans or just launching a Goblin Spirit Bombardment at opponents' faces.
I thought about adding loops with Reveillark, Karmic Guide, and more sac outlets, or even just Nim Deathmantle to go with Ashnod's Altar. There's also more ways to go heavy on Teshar, Ancestor's Apostle loops, or add things like Angelic Renewal + Auramancer + sac outlet, but I don't want to be too combo heavy. It's meant to be plan B.
Boros is Boros of course, so there's the age old issue of ramp and draw. I think some of the new toys, namely Archaeomancer's Map, will smooth things out a bit. I'm excited to see how that card plays out with stuff like Weathered Wayfarer/Expedition Map + Flagstones of Trokair/Cascading Cataracts/Darksteel Citadel + Cleansing Wildfire/Lotus Field. I also can't wait to unlock the achievement of having Aggressive Mining in play with Archaeomancer's Map, drawing 8 in a turn cycle, and never falling behind on land parity.