So, Mirage Deck:
It's really almost the same as Svengali deck. It's just sprayed with Roughing fluid like Invisible deck. and you can spread cards and show faces of them. In the Svengali you can't.
But don't buy Mirage. buy Svengali and Roughing fluid. And then you'll be able to create Invisible deck, Mirage deck, Brainwave, Ship deck, Split deck, etc.