Apart from missing three copies of Brazen Borrower and having a clunky mana base without Breeding Pool, the Challenger Deck list is actually very close to the optimal build of the deck
The flexibility just was not worth it
Number 70 Language English Legal Formats Brawl, Commander, Competitive Brawl, Historic, Legacy, Modern, Pioneer, Timeless, Vintage Not Legal Formats Alchemy, Pauper, Standard Rulings (7/13/2016) If you cast the exiled card, you do so as part of the resolution of Mind's Dilation's ability
While this card really only belongs in a sliver deck, it deserves its spot on this list by being a useful card for an already powerful creature type
(Aside: Eye of Ugin does not work the way you want it to with Kozilek
Triggers happen in such a way that his enter-the-battlefield ability brings back See the Unwritten if youd like, and he ensures that youll be able to snap off the Ferocious trigger next time (if he survives)