Aup mate, I wasn't active on here when you first posted this, but as a massive fan of planechase, and after talking about random MTG and cubes etc with you. I played a slightly modified version of Multiverse this weekend and it was awesome!
I added a face the hydra symbol to the die that I made and excluded the hoard idea, I also excluded the Nexus and the Ancient artifact for our 1st blast due to personal preference. The dual planes was left off, but I realised this was a mistake and it will definitely be added next time we play.
We cubed our decks, then played the varient and had so much fun. It stops one person roflstomping early from a god hand, functions to break up game states very well, and adds more great elements of randomness that has been lost in EDH due to popularity, power creep, and lack of creativity IMO. This helps immensely. We played with all 85 planes and phenomina that exist, I even managed to roll chaos on
Tazeem and draw 11...mostly lands but still lol!
None of the planes broke the game, as people had to find targets and by the time they had, they could have lost advantage, or fallen prey to hydra etc.
I definitely will not play anything else on the weekend with my mates after this. Its awesome and balances power so nicely. It also reduces the chance of people staying on a plane to gain advantage as you can simply get to a plane or get the hydra to make them shift. Love it! Well done!