Divining Witch and Laboratory Maniac on the battlefield.
Divining Witch does not have summoning sickness.
You have at least one card in hand.
You have a way to draw a card.
({1} magic symbol) ({B} magic symbol) available.
Steps
Activate Divining Witch by paying ({1} magic symbol) ({B} magic symbol) , tapping it and discarding a card, naming Divining Witch and exiling your library due to it not containing a card named Divining Witch.
Draw a card, causing you to win the game due to drawing from an empty library.