Nevinyrral, Urborg Tyrant, and Phyrexian Altar

Prerequisites

• Nevinyrral, Urborg Tyrant in the command zone
• Phyrexian Altar on the battlefield
• , plus additional mana dependent on how many creatures have died this turn and commander tax available

Steps

1. Cast Nevinyrral by paying plus commander tax
2. Nevinyrral enters the battlefield
3. In response, activate Phyrexian Altar by sacrificing Nevinyrral, adding
4. Decline to pay for Nevinyrral's leave the battlefield trigger
5. Resolve Nevinyrral's ETB trigger, creating a tapped 2/2 Zombie creature token for each creature that died this turn
6. Activate Phyrexian Altar by sacrificing all Zombie tokens, adding for each
7. Repeat

Results

• Infinite colored mana
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers
• Infinite tapped creature tokens