For the cost of each color mana, you can give your creatures a ton of useful keywords haste, trample, and lifelink and an additional combat phase
For example, Jaws of Defeat and Reunion of the House fit here perfectly, but I could see them breaking out in other strategies, too
Take cards like Bone Shredder, Serrated Scorpion and Sling-Gang Lieutenant, mix them in with some sacrifice outlets like Deadly Dispute, Viscera Seer, and Bolass Citadel and youll have the makings of a Shirei deck
Whisperwood is preordering for about $5 right now, which is pretty close to bulk mythic as it is
Make heavy use of protective cards like Avacyn's Memorial and Greater Auramancy and counterspells like Dovin's Veto or Counterspell to keep Sanctum of All out for as long as you can