Aside from those obvious staples, Dragon decks with red and green should include Klauth, Unrivaled Ancient to swiftly attack and pour lots of mana into the player's mana pool
That mechanic is a throughline for Magic gods, not FINAL FANTASY ones, and it was a real bummer for Hydaelyn to have a downside when you needed to spend seven mana to flip her
Here are some incentives for it: Cards like Corrupt, Cabal Coffers, Mutilate, and Defile want you to play as many swamps as possible, so their efficiency is maximized in mono-black decks
Even Relentless Dead is hard to deal with
You can choose to give the purple hippo trample and give your opponent a 1/1 green token, give the purple hippo flying and target opponent two life or return the hippo to your hand and target opponent may draw a card
City of Brass, as well as Mana Confluence, typically show up in decks with intense color requirements