Led by Sauron, Lord of the Rings, this deck is all about controlling the board to make way for your biggest spells
Izzet: Pros: Can play big artifacts quickly thanks to Saheeli, the Gifted
But the main big mechanic of the set is Prototype, which allows players to cast cards paying a lower alternative cost
If a land or Bird you control entering at the same time as Traveling Chocobo (including Traveling Chocobo itself) causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time
It can be tricky to get this off multiple times, but its very potent if you can manage it
This Demon looks to sweep the board of small creatures and generate energy as creatures die, even beyond its enters-the-battlefield effect