Inspiring Overseer replaces Priest of Ancient Lore:
Out with the old in with the new. Priest of ancient lore now comes with flying and 1 life on entering the battlefield.

Demon's Due replaces Read the Bones:
The writing is on the wall, trading sorcery speed for 1 extra mana and instant speed seems like a fair trade-off.

Exhibition Magician replaces Ghirapur Gearcrafter:
We can agree that Ghirapur Gearcrafter is the better flicker target. While not quite the same body swap, the versatility of treasure or extra bodies may be worth losing the aggressive body of a flying token.

Goldhound to replace Grim Initiate:
Goldhound is just another of WotC's plans to make 1/1 for 1 playable. Getting the extra body from Grim Initiate wasn't too important in red and often the first strike ability didn't come into play. Goldhound is just harder to block and can fetch us extra mana for a turn.

Witty Roastmaster replaces Fervent Cathar:
Witty Roastmaster allows damage to get through, even in board stalls. This card will be taunting your opponents asking for it to be removed. Something that Fervent Cathar could not do.

Jewel Thief replaces Yavimaya Elder:
This is the crowning jewel of all 3 drops. Jewel thief is not only a 3/3 for three, it has not one, not two, but also three abilities tacked onto it. It has the most efficient body and fixes your mana for a turn. While it doesn't draw you as many cards or guarantee land drops as Yavimaya Elder, its aggressively pushed body plays better on both offense and defence and not something you just trade-off.

Girder Goons replaces Yuan-ti Fang-blade:
You're never going to hard cast Girder Goons. It will always be a 2/2 that draws you a card and nets you 4 damage. Yuan-ti Fang-blade while interesting never really got to a point where it drew you a card.

Body Dropper replaces Auger Spree:
What a jaw dropper this card is. Body dropper has the same effect that Mortician Beetle has but with a sacrifice engine built into it. It replaces Auger Spree as the colour pair has an overabundance of removal spells. Augur Spree could make a comeback if more reliable shield counter, regenerate or indestructible creatures make an appearance in the format.

Glamorous Outlaw, Masked Bandits, Rakish Revelers, Shattered Seraph, & Spara's Adjudicators replaces Nightscape Familiar, Sangrite Backlash, Wild Nacatl, Esper Stormblade, & Crystallization:
The entire shard cards have been replaced with the new New Capenna tri-colour cards. Not only do they provide colour fixing, they all provide a solid body/effect on the high end of the mana curve. The older ones were more mana efficient but they just didn't provide much justification to be in three colours, barring Nightscape Familiar. That card is cut for both financial reasons and to freshen the format.

Join the Maestros:
If you can't beat them join them. Join the Maestros is a fine outlet to sacrifice strategies, giving you a way to trigger the on death effects as well as upgrading the body.

Big Score:
Unexpected Windfall has surprisingly got easier to cast. This card scores a spot on the cube list as the recent years has shown that treasure tokens do indeed make this a good deal to cast.

Sticky Fingers:
Handpicking a few of the keywords from Ragavan doesn't quite get you a Ragavan but it sure does get pretty close. Usually auras suffer the fate of not providing enough utility to justify the risk of being 2 for 1'd. There is at least an insurance policy if this card lands that its worth letting the card stick around for a few test runs.

Botanical Plaza, Racers' Ring, Skybridge Towers, Tramway Station, & Waterfront District:
This new cycle of lands will give the other colour pairings equal footing against the campus lands from Strixhaven.