Six, Urza's Saga, Auramancer, Phyrexian Altar, and Semblance Anvil

Prerequisites

• Six on the battlefield
• Urza's Saga in hand
• Auramancer in the graveyard
• Phyrexian Altar on the battlefield
• Semblance Anvil on the battlefield
• There is a creature card exiled with Semblance Anvil available

Steps

1. Cast Auramancer from your graveyard for its retrace cost by paying and discarding Urza's Saga
2. When Auramancer enters the battlefield, it triggers, returning Urza's Saga from your graveyard to your hand
3. Activate Phyrexian Altar by sacrificing Auramancer, adding
4. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite storm count
• Infinite self-discard triggers