Vin, Greater Chaos Chao

When Vin enters the battlefield take the top half of your deck rounded down and shuffle it with the other half of your library upside down.
You can play face up cards on top of your library, those cards cost {1} less.
If Vin would be destroyed by a non-damage source you may pay {r}, and if you do instead shuffle him into your library face up.
You may play Vin without paying his mana cost
if he is face up on top of your library.