For that series, I would grab a tough-to-build around Commander that was in the wrong colors or had a virtually impossible concept, and then try to build a deck around that leader
With over 10000 cards available, the number of Magic: The Gatherings card combos you could devise is practically infinite
With a staggeringly high cost of fifteen mana to cast, Emrakul likely won't be coming down early in the game
However, since very few exist and they provide intriguing and powerful effects, a number from Mirage have retained high price points, this one included
Niblis of Frost has Prowess, a Tarkir block mechanic that was well received by players
More than ever I expect that real mastery of this environment will depend on understanding which of these tools is most irreplaceable for each archetype, and which can potentially be replaced deeper in the draft