Emrakul, the Promised Friend (EDH / Commander)

Inspired by this Reddit post: https://www.reddit.com/r/EDH/comments/67mzqq/found_an_alternative_way_of_playing_emrakul_the

The idea is to use Emmy to hand out productive extra turns to the players who need it the most, and thus help balancing the pod. Getting a self-protecting, evasive two-hit finisher is a nice bonus. The stuff in the "Bounce" category makes sure we can cast Emmy repeatedly, while the cards in "General" and "Specific" further help us to get everyone involved in the game and even the playing field.

Winning should be relatively easy with Emmy or any of the other huge monsters, but there is also a family of janky infinite-turns combos consisting of
Erratic Portal / Decoction Module
Vedalken Orrery
Unwinding Clock
enough mana rocks to recast Emmy on each opponent's turn

Tokens Needed:
Eldrazi Spawn, Eldrazi Scion, Marit Lage, Monarch, City's Blessing

Additional Options:
Planar Portal for tutoring
Metalworker, Grim Monolith for mana
Ugin, the Spirit Dragon, Karn Liberated, Karn, the Great Creator
Storm Cauldron as we should have enough mana rocks to break symmetry?
Sanctum of Eternity
Mystic Forge
Lithoform Engine
Forsaken Monument
Crawling Barrens

Eldrazi titans with Annihilator would make strong additions, but never lead to fun game states in my experience.