The overall theme is making more than the 23 nonland cards in your deck matter. To that end, I've included conspiracies and draft interaction cards from Conspiracy, lesson/learn spells from Strixhaven, spell lands from Zendikar Rising, a few companions, and abundant land-based mana fixing.

There are 10 main archetypes, one for each color pair.

White-Blue: Flicker

Blue-Black: Cycling

Black-Red: Madness

Red-Green: Go-big agro

Green-White: +1/+1 counters

White-Black: Artifact tokens

Blue-Red: Spells/Pyromancers

Black-Green: Recursive agro

Red-White: Go-wide aggro

Green-Blue: Kicker and Ramp

ERRATA: Arcane Savant's ability only triggers if it was cast. Backup Plan paired with Sovereign's realm does not allow you to draw an extra hand of 7 cards. Companions are played as-written and can be cast directly from the command zone.