Sun Titan, Yahenni, Undying Partisan, and Shade's Form

Prerequisites

• Sun Titan on the battlefield
• Yahenni, Undying Partisan on the battlefield
• Shade's Form on the battlefield

Steps

1. Activate Yahenni by sacrificing Sun Titan
2. When Sun Titan dies, Shade's Form triggers, returning Sun Titan from your graveyard to the battlefield
3. When Sun Titan enters, it triggers, returning Shade's Form from your graveyard to the battlefield attached to Sun Titan
4. Resolve the Yahenni ability
5. Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite sacrifice triggers