Had not the land become so Mundane, I'm sure it could have repaired itself by Recusion. That would be Purple Green Orange Blue Yellow Red.  I expect it would have gone something like this...

Purple Combination - Gillikin country Tip makes Pumpkinhead and escapes becoming statue

Green Allegory - riding Sawhorse escapes to Emerald city of Refuge

Orange Virtuality - where King Scarecrow considers his Ownership by Mombi

Blue Already-has-been - and sends him to Glinda who looks to see who he was

Yellow Completion - and overcomes the Barriers set up by Mombi

Red Change - which causes Tip to change back into Ozma

Instead, the land had become so mundane that the desert wasn't even all that Deadly anymore. It had to cure itself by Apparent Causality, Creation, the order of the days of the Week. Which is Purple Red Orange Blue Green Yellow, Monday Tuesday Wednesday Thursday Friday Saturday

Purple Absence - Gillikin country Tip makes Pumpkinhead and escapes becoming statue

Red Action - losing Sawhorse runs into Jinjur who is leading Red Revolt

Orange Control of Conditions - they escape to Nick and return to Emerald city where they have temporary success but are trapped, and escape to Orange Ownership Theft jackdaw nest where the Scarecrow becomes a man of money and they all acquire wealth

Blue Authority Modification - and arrive at Glinda who decides they really need the real heir

Green Internal Change Perception - and they play hide and seek with Mombi and capture her

Yellow External Change Completion - and make Mombi change Tip back into Ozma

((  Glinda uses a Pearl of Truth. Blavatsky was of the opinion that the wisdom of India was derived from the Greek Pythagoreans rather than the other way around that Vedantists like to believe. Evidence to this effect is that the first written Sanskrit material is about 500 years later than Classical Greece and a good many Sanskrit words for philosophical memes, including the names of the signs of the Zodiac, are actually garbled Greek. She was of the opinion that the Sanskrit word for Pearl "Mani" was derived from the Egyptian Hieroglyphic and Coptic word "Meini" which is from "Mei" = "Sea" and "Oni" = "Gem", thus "Sea gem" meaning Pearl. Which puns with "Meini" which is from "Mei" = "Truth" and "Oni" = "Gem", thus "Truth gem" and so an appropriate item to go in a Lotus to represent ever expanding awakening from the delusion of apparent reality. ))