Phyrexian Altar, Feign Death, Repository Skaab, and Necroduality

Prerequisites

• Phyrexian Altar on the battlefield
• Feign Death in hand
• Repository Skaab on the battlefield
• Necroduality on the battlefield
• available

Steps

1. Cast Feign Death by paying , targeting Repository Skaab
2. Activate Phyrexian Altar by sacrificing Repository Skaab, adding
3. When Repository Skaab dies, it triggers, returning it from your graveyard to the battlefield
4. When Repository Skaab enters the battlefield, its exploit ability and Necroduality trigger
5. Resolve the Necroduality trigger, creating a token copy of it
6. When the Repository Skaab token enters the battlefield, its exploit ability triggers; choose not to sacrifice a creature
7. Resolve the Repository Skaab trigger from step 4, sacrificing the Repository Skaab token
8. Repository Skaab's second ability triggers, returning Feign Death to your hand from your graveyard
9. Repeat

Results

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