Ashnod's Altar, Mardu Warshrieker, and Nim Deathmantle

Prerequisites

• Ashnod's Altar on the battlefield
• Mardu Warshrieker on the battlefield
• Nim Deathmantle on the battlefield
• You have attacked this turn
• available

Steps

1. Activate Ashnod's Altar by sacrificing Mardu Warshrieker, adding
2. Nim Deathmantle triggers, causing you to pay to return Mardu Warshrieker from your graveyard to the battlefield and attach Nim Deathmantle to it
3. Mardu Warshrieker enters the battlefield, adding
4. Repeat

Results

• Infinite black mana
• Infinite colorless mana
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite red mana
• Infinite sacrifice triggers
• Infinite white mana