Hofri Ghostforge, Eternal Scourge, and Ashnod's Altar

Prerequisites

• Hofri Ghostforge on the battlefield
• Eternal Scourge on the battlefield
• Ashnod's Altar on the battlefield
• available

Steps

1. Activate Ashnod's Altar by sacrificing Eternal Scourge, adding
2. Eternal Scourge dies, triggering Hofri, exiling Eternal Scourge and creating a token copy of it that's a Spirit in addition to its other types
3. Cast Eternal Scourge from exile by paying
4. Activate Ashnod's Altar by sacrificing the Eternal Scourge token, adding
5. The Eternal Scourge token dies, returning nothing to your graveyard due to Eternal Scourge no longer being in exile
6. Repeat

Results

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