This card's gonna be pretty gnarly, but it likely won't be anything too crazy being restricted to mono-white
What makes Eminence and all of these cards so broken is that there's quite literally no way to interact with the Eminence ability since there's no way to interact with cards in the command zone, which means the Eminence decks have a massive advantage from the very first turn of the game
The Madrigal family in particular are well represented across both Amber and Amethyst colours: Felix, Julieta and Mirabel all appear in Amber, with Bruno, Dolores and Luisa in Amethyst, for example
Ultimate Magic: Holy showcases those final moments where hope seems lost, yet the Lifestream joins with Holy to save the planet in the end
He led the design for a set codenamed "Menagerie" which would become Mirage and Visions
Remember that the spell must also have a mana value equal to or less than the discover number