Thanks to TCGPlayer for the data and information that informed this article.
Here's a little teaser of three cards from The List that will appear in Zendikar Rising Set Boosters
Unlike other treasons, its actually possible to play Zidane as a kind of value card
Kains almost-comical ability to be forced into betraying you is delightfully woven into Magic with his card, Kain, Traitorous Dragoonwhenever Kain does damage to another player, they can choose to take control of him and he does mirrored damage to his original owner, meaning that Kain can bounce back and forth between ownership over the course of the game
That leaves you with a four-mana 7/7 and according to my calculations is a good deal
Not only by destroying some deck ideas from the very beginning, but also by limiting your card space, if you need to accomodate for one or the other Neo Exdeath counter