Cast Nexus of Fate, shuffling it into your library.
Activate Proteus Staff targeting the nontoken creature you control, putting it on the bottom of your library and revealing cards until you reveal the nontoken creature and putting putting Nexus of Fate on top of your library.
Pass the turn.
Draw a card.
Repeat.

Infinite extra turns

Proteus Staff

Nexus of Fate

Cast Beacon of Tomorrows, shuffling it into your library.
Activate Proteus Staff targeting the nontoken creature you control, putting it on the bottom of your library and revealing cards until you reveal the nontoken creature and putting Beacon of Tomorrows on top of your library.
Pass the turn.
Draw a card.
Repeat.

Combos with "Proteus Staff"