I don't know how wise it would be for a chef to have the Cabbage Merchant as one off their vendors;, I'm sure a lot of shipments would go missing before they get to the restaurant
In spite of its many years, it's still the best reanimation effect in the game
Kaalia, of course, combos well with many of the other Mardu staples that care about creatures entering and attacking, like Warstorm Surge and Fervent Charge
Narset, Parter of Veils and Ashiok, Dream Render are new planeswalkers that are nice at shutting down some of the more egregious things your opponents can do in Commander
As for gameplay, Venom lets you sacrifice cards to draw and play other spells, potentially shifting your board state pretty quickly
While less immediately obvious, theres a lot of strategic synergy to be found in a flicker subtheme here