Colfenor, the Last Yew, Ashnod's Altar, Walking Ballista, and Stonecoil Serpent

Prerequisites

• Colfenor, the Last Yew on the battlefield
• Ashnod's Altar on the battlefield
• Walking Ballista on the battlefield
• Stonecoil Serpent in the graveyard
• At least one +1/+1 counter on Walking Ballista

Steps

1. Sacrifice Walking Ballista to Ashnod's Altar for
2. Colfenor triggers, returning Stonecoil Serpent from your graveyard to your hand
3. Cast Stonecoil Serpent for
4. Sacrifice Stonecoil Serpent to Ashnod's Altar for
5. Colfenor triggers, returning Walking Ballista from your graveyard to your hand
6. Cast Walking Ballista for
7. Repeat

Results

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