Saffi Eriksdotter, Ashnod's Altar, and Hero of the Dunes

Prerequisites

• Saffi Eriksdotter on the battlefield
• Ashnod's Altar on the battlefield
• Hero of the Dunes in hand

Steps

1. Activate Saffi by sacrificing it, targeting Hero of the Dunes Activate Ashnod's Altar by sacrificing Hero of the Dunes When Hero of the Dunes dies, Saffi triggers, returning Hero of the Dunes from your graveyard to the battlefield
2. When Hero of the Dunes enters, it triggers, returning Saffi from your graveyard to the battlefield
3. Repeat

Results

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