Mazzy, Truesword Paladin, Phyrexian Altar, Gift of Immortality, and Emrakul's Hatcher

Prerequisites

• Mazzy, Truesword Paladin on the battlefield
• Phyrexian Altar on the battlefield
• Gift of Immortality on the battlefield
• Emrakul's Hatcher on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing Emrakul's Hatcher, adding
2. When Emrakul's Hatcher dies, Mazzy's second ability and Gift of Immortality trigger
3. Resolve the Mazzy trigger, exiling Gift of Immortality with the ability to cast it until end of your next turn
4. Resolve the Gift of Immortality trigger, returning Emrakul's Hatcher from your graveyard to the battlefield
5. When Emrakul's Hatcher enters, it triggers, creating three creature tokens
6. Activate two creature tokens by sacrificing them, adding
7. Cast Gift of Immortality from exile by paying , attaching it to Emrakul's Hatcher
8. Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite sacrifice triggers
• Infinite storm count