Colfenor, the Last Yew, Phyrexian Altar, and Doomed Dissenter

Prerequisites

• Colfenor, the Last Yew on the battlefield
• Phyrexian Altar on the battlefield
• Doomed Dissenter on the battlefield

Steps

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

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB