Phyrexian Altar + Relentless Dead Combos

3 known combos featuring both cards in Commander

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

Combo 1 with Rooftop Storm

Also requires:

Results: Infinite death triggers · Infinite ETB · Infinite LTB · Infinite sacrifice triggers · Infinite storm count

Steps

Activate Phyrexian Altar by sacrificing Relentless Dead, adding {B}.
Relentless Dead's first and second abilities trigger.
Resolve Relentless Dead's first ability, causing you to pay {B} to return Relentless Dead from your graveyard to your hand.
Resolve Relentless Dead's second abilitiy, choosing not to pay.
Cast Relentless Dead by paying {0}.
Repeat.

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Also requires:

Results: Infinite LTB · Infinite ETB · Infinite sacrifice triggers · Infinite death triggers

Show steps

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