Saffi Eriksdotter, Reveillark, and Ashnod's Altar

Prerequisites

• Saffi Eriksdotter on the battlefield
• Reveillark on the battlefield
• Ashnod's Altar on the battlefield

Steps

1. Activate Saffi by sacrificing it, targeting Reveillark
2. Activate Ashnod's Altar by sacrificing Reveillark, adding
3. When Reveillark dies, it and Saffi trigger
4. Resolve the Saffi trigger, returning Reveillark from your graveyard to the battlefield
5. Resolve the Reveillark trigger, returning Saffi from your graveyard to the battlefield
6. Repeat

Results

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