Iridescent Drake, Shade's Form, and Carrion Feeder

Prerequisites

• Iridescent Drake on the battlefield
• Shade's Form on the battlefield
• Carrion Feeder on the battlefield
• Shade's Form attached to Iridescent Drake

Steps

1. Activate Carrion Feeder by sacrificing Iridescent Drake
2. When Iridescent Drake dies, Shade's Form triggers, returning Iridescent Drake from your graveyard to the battlefield
3. When Iridescent Drake enters the battlefield, it triggers, returning Shade's Form from your graveyard to the battlefield attached to Iridescent Drake
4. Resolve the Carrion Feeder ability from step 1, putting a +1/+1 counter on it
5. Repeat

Results

• Infinite +1/+1 counters on Carrion Feeder
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers