Colfenor, the Last Yew, Ashnod's Altar, Endless One, and Ugin's Conjurant

Prerequisites

• Colfenor, the Last Yew on the battlefield
• Ashnod's Altar on the battlefield
• Endless One on the battlefield
• Ugin's Conjurant in the graveyard
• At least one +1/+1 counter on Endless One

Steps

1. Sacrifice Endless One to Ashnod's Altar for
2. Colfenor triggers, returning Ugin's Conjurant from your graveyard to your hand
3. Cast Ugin's Conjurant for
4. Sacrifice Ugin's Conjurant to Ashnod's Altar for
5. Colfenor triggers, returning Endless One from your graveyard to your hand
6. Cast Phyrexian Marauder for
7. Repeat

Results

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