Colfenor, the Last Yew, Phyrexian Altar, and Brindle Shoat

Prerequisites

• Colfenor, the Last Yew on the battlefield
• Phyrexian Altar on the battlefield
• Brindle Shoat on the battlefield

Steps

1. Sacrifice Brindle Shoat to activate Phyrexian Altar, adding
2. Brindle Shoat's death trigger creates a 3/3 Boar token
3. Sacrifice the Boar to activate Phyrexian Altar, adding
4. Return Brindle Shoat to your hand using Colfenor's trigger
5. Repeat

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB