Necroduality, Phyrexian Altar, Repository Skaab, and Supernatural Stamina

Prerequisites

• Necroduality on the battlefield
• Phyrexian Altar on the battlefield
• Repository Skaab on the battlefield
• Supernatural Stamina in hand
• available

Steps

1. Cast Supernatural Stamina 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 Supernatural Stamina 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