Nevinyrral, Urborg Tyrant, Phyrexian Altar, and Nim Deathmantle

Prerequisites

• Nevinyrral, Urborg Tyrant on the battlefield
• Phyrexian Altar on the battlefield
• Nim Deathmantle on the battlefield
• At least two creatures have died this turn
• available

Steps

1. Activate Phyrexian Altar by sacrificing Nevinyrral, adding
2. When Nevinyrral dies, its second ability and Nim Deathmantle trigger
3. Resolve the Nevinyrral trigger, choosing not to pay
4. Resolve the Nim Deathmantle trigger, causing you to pay to return Nevinyrral to the battlefield from your graveyard, and attach Nim Deathmantle to it
5. When Nevinyrral enters the battlefield, its first ability triggers, creating a tapped 2/2 Zombie creature token for each creature that has died this turn
6. Activate Phyrexian Altar three times by sacrificing three Zombie tokens, adding
7. Repeat

Results

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