how does Possibility Storm work magic

[Footprint]

how does Possibility Storm work?

[DatAsh]

Possibility Storm

Okay, here's an example:

I have a Possiblity Storm on the battlefield.

I cast a Blistercoil Weird, and I exile it while it is on the stack. Then I exile cards from the top of my deck one by one until I exile a creature card, let's say Melek, Izzet Paragon. I can then cast Melek without paying its mana cost, so for free. Once I do this, I put all other exiled cards on the bottom of my library in a random order. I can't be more clear than that.

[Arix]

Once I do this, I put all other exiled cards on the bottom of my library in a random order.

For clarity, this includes the original spell that was cast (in this example, the Blistercoil Weird).