Commander Liara Portyr, Eternal Scourge, Ashnod's Altar, and Planar Void

Prerequisites

• Commander Liara Portyr on the battlefield
• Eternal Scourge on the battlefield
• Ashnod's Altar on the battlefield
• Planar Void on the battlefield
• You control at least two creatures that can attack this turn
• You have at least two opponents

Steps

1. Declare at least two creatures you control as attackers, attacking at least two opponent
2. Liara triggers, causing all spells you cast from exile this turn to cost at least less, and exiling at least two cards from the top of your library and allowing you to play them this turn
3. Move to your post-combat main phase
4. Activate Ashnod's Altar by sacrificing Eternal Scourge, adding
5. Planar Void triggers, exiling Eternal Scourge from your graveyard
6. Cast Eternal Scourge from exile by paying
7. Repeat from step 4

Results

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