Melira, Sylvok Outcast, Safehold Elite, and Ashnod's Altar

Prerequisites

• Melira, Sylvok Outcast on the battlefield
• Safehold Elite on the battlefield
• Ashnod's Altar on the battlefield

Steps

1. Activate Ashnod's Altar by sacrificing Safehold Elite, adding
2. Safehold Elite dies, triggering its persist ability, returning it from your graveyard to the battlefield without a -1/-1 counter on it due to Melira
3. Repeat

Results

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