By the time you have seven mana to transform, your opponent should be ready to win the game
those options give you immediate value when you discard and consistent access to discard effects
Whether or not you should sell a golden chocobo is a tough answer, but if you must have an answer right away, I'd find the card grading service I trust the most, get the chocobo in a slab and hold onto it
You won't always be able to get both Madam Mim and Fairy Godmother to stick on the board long enough to pull this off, but with their reduced Shift cost of three and two-ink respectively, you'll likely get both of them down on the board at the same time fairly often
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The result kind of looks like a haunting half-chicken or something