Basri's Lieutenant, Odric's Outrider, and Phyrexian Altar

Prerequisites

• Basri's Lieutenant on the battlefield
• Odric's Outrider on the battlefield
• Phyrexian Altar on the battlefield
• You control at least two additional creatures, at least one of which has a +1/+1 counter on it

Steps

1. Activate Phyrexian Altar by sacrificing a creature with a +1/+1 counter on it, adding one mana of any color
2. The creature dies, triggering Basri's Lieutenant and Odric's Outrider
3. Resolve the Basri's Lieutenant trigger, creating a 2/2 Knight creature token
4. Resolve the Odric's Outrider trigger, putting a +1/+1 counter on another creature you control
5. Repeat

Results

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