I will definitely be running this card. Mindslaver is back and with a vengeance.
This card should never cost more than 8, Making a deck where your Top end is Emrakul 15 and your mid range is Emrakul 7-9.
Could promote All is Dust in a non-eldrazi aggro meta, although EmrakulSlaver/Mindrakul ruins every single deck in the meta atm. I cannot contain my enthusiasm as someone who has debated running the card mindslaver always and played Control Slaver for 4+ years prior to playing Legacy.