Activate Phyrexian Altar by sacrificing Martyr for the Cause, adding one mana of any color.
When Martyr for the Cause dies, it triggers, putting an indestructible counter on Myojin.
Activate Myojin by removing an indestructible counter from it, returning Martyr for the Cause from your graveyard to the battlefield.
Repeat.

Infinite blinking

Infinite colored mana

Infinite death triggers

Infinite creature ETB

Infinite creature LTB

Infinite proliferate

Infinite creature sacrifice triggers

Myojin of Grim Betrayal

Martyr for the Cause

Phyrexian Altar

Activate Ashnod's Altar by sacrificing Martyr for the Cause, adding {C}{C}.
Martyr for the Cause dies, triggering itself and Magnanimous Magistrate twice.
Resolve both Martyr for the Cause triggers, causing you to put two reprieve counters on Magnanimous Magistrate.
Resolve the first Magnanimous Magistrate trigger, choosing not to remove any counters.
Remove the second Magnanimous Magistrate trigger, causing you to remove two reprieve counters from Magnanimous Magistrate and return Martyr for the Cause from your graveyard to the battlefield.
Repeat.

Infinite colorless mana

Teysa Karlov

Magnanimous Magistrate

Ashnod's Altar

Activate Ashnod's Altar by sacrificing Martyr for the Cause, adding {C}{C}.
When Martyr for the Cause dies, it triggers, putting an indestructible counter on Myojin.
Activate Myojin by removing an indestructible counter from it, returning Martyr for the Cause from your graveyard to the battlefield.
Repeat.

Activate Phyrexian Altar by sacrificing Martyr for the Cause, adding one mana of any color.
Martyr for the Cause dies, triggering itself and Magnanimous Magistrate twice.
Resolve both Martyr for the Cause triggers, causing you to put two reprieve counters on Magnanimous Magistrate.
Resolve the first Magnanimous Magistrate trigger, choosing not to remove any counters.
Remove the second Magnanimous Magistrate trigger, causing you to remove two reprieve counters from Magnanimous Magistrate and return Martyr for the Cause from your graveyard to the battlefield.
Repeat.

Activate Ashnod's Altar by sacrificing Martyr for the Cause, adding {C}{C}.
Martyr for the Cause dies, triggering itself and Magnanimous Magistrate.
Resolve the Martyr for the Cause trigger, causing you to proliferate, putting two reprieve counters on Magnanimous Magistrate.
Resolve the Magnanimous Magistrate trigger, causing you to remove two reprieve counters from Magnanimous Magistrate and return Martyr for the Cause from your graveyard to the battlefield.
Repeat.

Doubling Season

Activate Phyrexian Altar by sacrificing Martyr for the Cause, adding one mana of any color.
Martyr for the Cause dies, triggering itself and Magnanimous Magistrate.
Resolve the Martyr for the Cause trigger, causing you to proliferate, putting two reprieve counters on Magnanimous Magistrate.
Resolve the Magnanimous Magistrate trigger, causing you to remove two reprieve counters from Magnanimous Magistrate and return Martyr for the Cause from your graveyard to the battlefield.
Repeat.

Combos with "Martyr for the Cause"