Altaïr Ibn-La'Ahad + Éomer, Marshal of Rohan + Gogo, Mysterious Mime + Conspiracy Combo

Éomer in your graveyard.

All other permanents on the battlefield (Conspiracy with "Assassin" chosen on the battlefield).

An opponent cannot block and kill Altaïr or Gogo.

At the beginning of your combat phase, Gogo triggers, causing it to become a copy of Altaïr with its name not changing, and causing both Gogo and Altaïr to get +2/+0 and haste until end of turn.

Declare Gogo and Altaïr as attackers, triggering their abilities.

Resolve the Altaïr trigger, exiling Éomer from your graveyard with a memory counter on it and creating a tapped and attacking copy of Éomer.

Resolve the Godo trigger, creating a tapped and attacking copy of Éomer.

Put either Éomer token into your graveyard due to the legend rule, triggering the other Éomer token, causing you to untap all creatures you control and to get an additional combat phase after this one.

At the end of your combat phase, Altaïr triggers, causing you to exile the Éomer token.

Repeat from step 2 each combat phase.

Infinite creature LTB

Infinite creature ETB

Infinite death triggers

Infinite combat phases

Infinite untap of creatures you control

Infinite mana creatures you control can produce