Since Rainbow Rare cards are no longer being printed, you should focus your search on card sets released between the Sun and Moon series, released in 2017, and the Scarlet and Violet series, released in 2022
Ive found my Golgari decks to fall into three categories, each of which I have a few payoffs for: sacrifice decks, graveyard decks, and midrange decks
Galea, Kindler of Hope is a great commander, allowing you to cheat around large equip costs if you cast Equipment from the top of your library instead of your hand
With every change to the game they also go back through the entire history of cards and update the rules text for consistency
(You do not use "Polymerization".) During either player's turn, when a Spell/Trap Card is activated: You can discard 1 card