Karmic Guide, Reveillark, and Phyrexian Altar

Prerequisites

• Karmic Guide on the battlefield
• Reveillark on the battlefield
• Phyrexian Altar on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing Karmic Guide, adding one mana of any color
2. Activate Phyrexian Altar by sacrificing Reveillark, adding one mana of any color
3. Reveillark dies, returning Karmic Guide from your graveyard to the battlefield
4. Karmic Guide enters the battlefield, returning Reveillark from your graveyard to the battlefield
5. Repeat

Results

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