Primeval Spawn, Chorus of the Conclave, Mortuary, and Ashnod's Altar

Prerequisites

• Primeval Spawn on the battlefield
• Chorus of the Conclave on the battlefield
• Mortuary on the battlefield
• Ashnod's Altar on the battlefield

Steps

1. Activate Ashnod's Altar by sacrificing Primeval Spawn, adding
2. When Primeval Spawn dies, its second ability and Mortuary trigger
3. Resolve the Mortuary trigger, putting Primeval Spawn on top of your library from your graveyard
4. Resolve the Primeval Spawn trigger, exiling the top ten cards of your library, and casting Primeval Spawn by paying a total of due to Chorus of the Conclave
5. Repeat

Results

• Exile your library
• Infinite +1/+1 counters on Primeval Spawn
• Infinite colorless mana
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers
• Infinite storm count