Doomed Necromancer, Gixian Puppeteer, Phyrexian Altar, and Fervor

Prerequisites

• Doomed Necromancer in the graveyard
• Gixian Puppeteer on the battlefield
• Phyrexian Altar on the battlefield
• Fervor on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing Gixian Puppeteer, adding
2. When Gixian Puppeteer dies, its second ability triggers, returning Doomed Necromancer from your graveyard to the battlefield
3. Activate Doomed Necromancer by paying , tapping and sacrificing it, returning Gixian Puppeteer from your graveyard to the battlefield
4. Repeat

Results

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