Evolution Witness, Sparring Construct, and Ashnod's Altar

Prerequisites

• Evolution Witness on the battlefield
• Sparring Construct on the battlefield
• Ashnod's Altar on the battlefield

Steps

1. Activate Ashnod's Altar by sacrificing Sparring Construct, adding
2. When Sparring Construct dies, it triggers, putting a +1/+1 counter on Evolution Witness
3. Evolution Witness triggers, returning Sparring Construct from your graveyard to your hand
4. Cast Sparring Construct by paying
5. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite colorless mana
• Infinite storm count
• Infinite +1/+1 counters on a creature