You can always build a completely unplayable thematic deck if you want to
Number 69 Language English Legal Formats Commander, Legacy, Modern, Pioneer, Vintage Not Legal Formats Alchemy, Brawl, Competitive Brawl, Historic, Pauper, Standard, Timeless Rulings (9/15/2013) When you scry, you may put all the cards you look at back on top of your library, you may put all of those cards on the bottom of your library, or you may put some of those cards on top and the rest of them on the bottom
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From what we can tell, these will work similarly to how past Japanese and Phyrexian cards have worked, meaning there will be card styles you'll need to collect