Kiki-Jiki and Scholar of the Ages on the battlefield.
({1} magic symbol) ({U} magic symbol) each turn available.
Steps
Cast Time Walk by paying ({1} magic symbol) ({U} magic symbol) , causing you to take an extra turn.
Activate Kiki-Jiki by tapping it, creating a token copy of Scholar of the Ages with haste.
The token copy of Scholar of the Ages enters the battlefield, returning Time Walk and any second instant or sorcery card from your graveyard to your hand.
Repeat each turn.
Results
Infinite recursion of instants and sorceries from your graveyard.