Teysa Karlov + Magnanimous Magistrate + Martyr for the Cause + Phyrexian Altar

Teysa Karlov

Magnanimous Magistrate

Martyr for the Cause

Phyrexian Altar

How it works

1. Activate Phyrexian Altar by sacrificing Martyr for the Cause, adding one mana of any color.
2. Martyr for the Cause dies, triggering itself and Magnanimous Magistrate twice.
3. Resolve both Martyr for the Cause triggers, causing you to put two reprieve counters on Magnanimous Magistrate.
4. Resolve the first Magnanimous Magistrate trigger, choosing not to remove any counters.
5. 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.
6. Repeat.