Jace in hand or on the battlefield or in your library.
({8} magic symbol) ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) plus an additional ({1} magic symbol) ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) if Jace is not on the battlefield available.
Steps
Cast Enter the Infinite by paying ({8} magic symbol) ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) , drawing your library and then putting any card besides Jace from your hand on top of your library.
If Jace is not on the battlefield, cast it by paying ({1} magic symbol) ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) .
Activate Jace's first loyalty ability by putting a loyalty counter on it, causing you to mill two cards and win the game due to drawing from an empty library.