Impromptu Raid, Mortuary, Ashnod's Altar, and Priest of Urabrask

Prerequisites

• Impromptu Raid on the battlefield
• Mortuary on the battlefield
• Ashnod's Altar on the battlefield
• Priest of Urabrask on the battlefield
• available

Steps

1. Activate Ashnod's Altar by sacrificing Priest of Urabrask, adding
2. When Priest of Urabrask dies, Mortuary triggers, putting Priest of Urabrask on top of your library from your graveyard
3. Actviate Impromptu Raid by paying , revealing Priest of Urabrask from the top of your library and putting it onto the battlefield
4. When Priest of Urabrask enters the battlefield, it triggers, adding
5. Repeat

Results

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