Magnanimous Magistrate + Doubling Season + Huatli's Raptor + Phyrexian Altar

Prerequisites

• Magnanimous Magistrate has at least three reprieve counters.

Steps

1. 1Activate Phyrexian Altar by sacrificing Huatli's Raptor, adding one mana of any color.
2. 2Huatli's Raptor dies, triggering Magnanimous Magistrate, causing you to remove two reprieve counters from Magnanimous Magistrate and return Huatli's Raptor from your graveyard to the battlefield.
3. 3Huatli's Raptor enters the battlefield, causing you to proliferate, putting two reprieve counters on Magnanimous Magistrate.
4. 4Repeat.

Effects

• Infinite colored mana
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers
• Infinite proliferate