Wormfang Drake in exile (exiled by Phantom Steed).
All other permanents on the battlefield.
Leyline of Transformation on the battlefield with "Samurai" chosen.
Steps
Declare Phantom Steed and Godo as attackers, triggering each of their second abilities.
Resolve the Godo trigger, untapping all creatures you control and causing you to get an additional combat phase after this one.
Resolve the Phantom Steed trigger, creating a token copy of Wormfang Drake.
When the token Wormfang Drake enters the battlefield, its first ability triggers, exiling Godo.
At the end of your combat phase, Phantom Steed triggers, causing you to sacrifice the Wormfang Drake token.
When the token Wormfang Drake leaves the battlefield, its second ability triggers, returning Godo from exile to the battlefield.
When Godo enters the battlefield, its first ability triggers, allowing you to search your library for an Equipment card and put it onto the battlefield.
Repeat each combat phase.
Results
Infinite LTB.
Infinite ETB.
Infinite combat phases.
Infinite untap of creatures you control.
Infinite mana creatures you control can produce.
Put all Equipment from your library onto the battlefield.