Rancor, Phyrexian Altar, Composer of Spring, and Dawn Evangel

Prerequisites

• Rancor in hand
• Phyrexian Altar on the battlefield
• Composer of Spring on the battlefield
• Dawn Evangel on the battlefield
• available

Steps

1. Cast Rancor by paying , attaching it to Composer of Spring
2. When Rancor enters the battlefield, Composer of Spring triggers
3. Holding priority, activate Phyrexian Altar by sacrificing Composer of Spring, adding
4. When Composer of Spring dies, Rancor and Dawn Evangel trigger
5. Resolve the Rancor trigger, returning it to your hand from the battlefield
6. Resolve the Dawn Evangel trigger, returning Composer of Spring to your hand from the battlefield
7. Resolve the Composer of Spring ability from step 2, putting Composer of Spring onto the battlefield from your hand
8. Repeat

Results

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