Teysa Karlov, Magnanimous Magistrate, Martyr for the Cause, and Ashnod's Altar

Prerequisites

• Teysa Karlov on the battlefield
• Magnanimous Magistrate on the battlefield
• Martyr for the Cause on the battlefield
• Ashnod's Altar on the battlefield
• Magnanimous Magistrate has at least one reprieve counter

Steps

1. Activate Ashnod's Altar by sacrificing Martyr for the Cause, adding
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

Results

• Infinite colorless mana
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite proliferate
• Infinite sacrifice triggers