Syrix, Carrier of the Flame, Skyfire Phoenix, Phyrexian Altar, and Pitiless Plunderer

Prerequisites

• Syrix, Carrier of the Flame on the battlefield
• Skyfire Phoenix on the battlefield
• Phyrexian Altar on the battlefield
• Pitiless Plunderer on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing Syrix, adding
2. Choose not to move Syrix from your graveyard to the command zone
3. Syrix dies, triggering Pitiless Plunderer, creating a Treasure token
4. Activate Phyrexian Altar by sacrificing Skyfire Phoenix, adding
5. Skyfire Phoenix dies, triggering Syrix and Pitiless Plunderer
6. Resolve the Pitiless Plunderer trigger, creating a Treasure token
7. Activate both Treasure tokens by tapping and sacrificing them, adding
8. Resolve the Syrix trigger, causing you to pay to cast Syrix from your graveyard
9. Skyfire Phoenix triggers, returning itself from your graveyard to the battlefield
10. Repeat

Results

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