Winning with cards you don't own.
Way back in the day, when Divining Witch first came out, I collected and traded for every copy I could find. My thinking was "this card sucks, someday I'm going to make it work and that will be hilarious!" Years later, I discover the Laboratory Maniac, and my dream of building a deck around the hilariously useless Divining Witch came to fruition.
To be even funnier, it utilizes the most famous Magic card ever (Black Lotus, without actually owning a copy) and one of the most useless cards ever, making this my fastest personal deck. It's capable of pulling 4th turn wins very consistently.
So here's how it works. Get the Lab Maniac out, use either the Divining Witch or Demonic Consultation to search for a card that's not in the deck (I love searching for a Black Lotus, just to see the look on people's faces) and exile my entire deck. Then, use any instant effect to force myself to draw another card and win.
The Puca's are a backup in case my guys get wiped. The Terramorphic Expanse are to help thin the deck out even further so I can nab my combo.