Sun Titan, Umbral Collar Zealot, and Gift of Immortality

Prerequisites

• Sun Titan on the battlefield
• Umbral Collar Zealot on the battlefield
• Gift of Immortality on the battlefield

Steps

1. Activate Umbral Collar Zealot 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, it triggers, returning Gift of Immortality from your graveyard to the battlefield attached to Sun Titan
4. Resolve the Umbral Collar Zealot ability
5. Repeat

Results

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