Sun Titan, Gift of Immortality, and Yahenni, Undying Partisan

Prerequisites

• Sun Titan on the battlefield
• Gift of Immortality on the battlefield
• Yahenni, Undying Partisan on the battlefield

Steps

1. Activate Yahenni by sacrificing Sun Titan
2. When Sun Titan dies, Gift of Immortality triggers, returning Sun Titan from your graveyard to the battlefield
3. When Sun Titan enters the battlefield, it triggers, returning Gift of Immortality from your graveyard to the battlefield attached to Sun Titan
4. Resolve the Yahenni ability, giving it indestructible until end of turn
5. Repeat

Results

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