Sun Titan, Unholy Indenture, and Bloodthrone Vampire

Prerequisites

• Sun Titan on the battlefield
• Unholy Indenture on the battlefield
• Bloodthrone Vampire on the battlefield

Steps

1. Activate Bloodthrone Vampire by sacrificing Sun Titan
2. When Sun Titan dies, Unholy Indenture triggers, returning Sun Titan from your graveyard to the battlefield
3. When Sun Titan enters, it triggers, returning Unholy Indenture from your graveyard to the battlefield attached to Sun Titan
4. Resolve the Bloodthrone Vampire ability
5. Repeat

Results

• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers
• Infinitely large creature until end of turn