Koll, the Forgemaster, Hero's Blade, Hope of Ghirapur, and Krark-Clan Ironworks

Prerequisites

• Koll, the Forgemaster on the battlefield
• Hero's Blade on the battlefield
• Hope of Ghirapur on the battlefield
• Krark-Clan Ironworks on the battlefield
• Hero's Blade attached to Hope of Ghirapur

Steps

1. Activate Krark-Clan Ironworks by sacrificing Hope of Ghirapur, adding
2. Hope of Ghirapur dies, triggering Koll, returning Hope of Ghirapur from your graveyard to your hand
3. Cast Hope of Ghirapur by paying
4. Hope of Ghirapur enters the battlefield, triggering Hero's Blade, attaching Hero's Blade to Hope of Ghirapur
5. Repeat

Results

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