I correct myself. The deck has a 100% win-rate only if you go first. If you go second, the win-con is still valid, but not 100% anymore.
This is how the deck goes. You go first, and spam every card in your hand. You dump a lot, and you draw a lot. Make sure to dump Makyura at least once in the process.
So once you dumped more than 15 cards in your graveyard, the activation condition for Exchange of the Spirit is now complete. Since Makyura is sent to the graveyard, you can activate it from your hand without having to set it.
As a result, the deck and graveyard of both players are reversed. All the cards in both player’s deck are now dumped, all all cards in both player’s graveyard is shuffled into the deck. As the opponent would have no cards in his/her graveyard, he/she would not have any cards to draw next turn.