Basri's Lieutenant, Metallic Mimic, and Phyrexian Altar

Prerequisites

• Basri's Lieutenant on the battlefield
• Metallic Mimic on the battlefield
• Phyrexian Altar on the battlefield
• You control at least one additional creature that has a +1/+1 counter on it
• "Knight" chosen with Metallic Mimic

Steps

1. Activate Phyrexian Altar by sacrificing another creature with a +1/+1 counter on it, adding one mana of any color
2. When the creature dies, Basri's Lieutenant's second ability triggers, creating a 2/2 Knight creature token that enters the battlefield with a +1/+1 counter due to Metallic Mimic
3. Repeat

Results

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