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Color is obvious you can order the colors however you like (I tend to use WUBRG just because thats how Wizards sort them on their lists of cards)

Maui - Hero to All Maui - Hero to All is the first inkable card on this list, and hes Rubys mid-game answer to any of the aggressively questing opponents

For a deck that is 100% optimized you'd likely call it bracket 5 and meant for cEDH

In terms of expensive cards to flip over, you can play cards that sort of have alternate casting costs but high mana values

The human clerk was also reprinted recently within the Dominaria Remastered set

Since most were discarded after testing, surviving copies are almost impossible to find, making this a true MTG collectible