Ashnod's Altar, and Darksteel Angel

Prerequisites

• Ashnod's Altar on the battlefield
• Darksteel Angel on the battlefield

Steps

1. Activate Ashnod's Altar by sacrificing the creature with persist
2. When that creature dies, its persist ability triggers, returning it from your graveyard to the battlefield without a -1/-1 counter on it due to Darksteel Angel Repeat

Results

• Infinite colorless mana
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers