Since The Sibsig Ceremony destroys your creatures that enter, giving you a 2/2 Zombie in exchange, once you get a second Myr Retriever you can just loop them until you have enough Zombies in play to sweep the board
If you include even one Game Changer in your deck, your deck is automatically Bracket 3 or higher
However, it also happens to have two really interesting abilities

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Chaos Mutation Chaos Mutation is restricted to up to one creature from each player, but this is Chaos Warp for any player, and spot on for any chaos deck
0: Draw a card -2: Create a 2/2 blue Spirit creature token with vigilance and Whenever you draw a card, put a +1/+1 counter on this creature -12: Target opponent chooses a permanent they control and returns it to its owners hand