I have a turn 4 Emrakul. Turn 1: Land Turn 2: Land Turn 3: Land, Dark Ritual, Belbe's Portal Turn 4: Land (Optional), Tap lands and Belbe's Portal, Play Emrakul
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Demonic Tutor to fetch the Blightsteel, Belbe's Portal to bring him out.
The KP/Teferi combo is a hard lock. Your opponent is locked out of casting ANYTHING. Teferi stops people casting spells when there are triggered abilities on the stack, KP requires spells cast while a triggered ability is on the stack. Stack Occupied = Opponent is f***ed.
That is a very good idea. Thank you.