Cavern Harpy, Parasitic Strix, and Aluren

Prerequisites

• Cavern Harpy in hand
• Parasitic Strix in hand
• Aluren on the battlefield
• You control at least one other black permanent

Steps

1. Cast Parasitic Strix by paying
2. Parasitic Strix enters the battlefield, causing target player to lose 2 life and gaining you 2 life
3. Cast Cavern Harpy by paying
4. Cavern Harpy enters the battlefield, returning Parasitic Strix to your hand
5. Activate Cavern Harpy by paying 1 life, returning it to your hand
6. Repeat

Results

• Infinite ETB
• Infinite lifegain
• Infinite lifegain triggers
• Infinite lifeloss
• Infinite LTB
• Infinite storm count