Relentless Dead + Necroduality + Phyrexian Altar

Prerequisites

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Steps

1. 1Cast Relentless Dead by paying .
2. 2When Relentless Dead enters the battlefield, Necroduality triggers, creating a token copy of it.
3. 3Activate Phyrexian Altar by sacrificing the nontoken Relentless Dead, adding .
4. 4When Relentless Dead dies, its first and second abilities trigger. Choose not to pay for either.
5. 5Activate [[FSO]] by sacrificing the token Relentless Dead, adding .
6. 6When the token Relentless Dead dies, its first and second abilities trigger.
7. 7Resolve the first trigger, choosing not to pay.
8. 8Resolve the second trigger, causing you to pay to return Relentless Dead from your graveyard to the battlefield.
9. 9Repeat from step 2.

Effects

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