Preston, the Vanisher, Karmic Guide, Breath of Life, and Phyrexian Altar

Prerequisites

• Preston, the Vanisher on the battlefield
• Karmic Guide in the graveyard
• Breath of Life in hand
• Phyrexian Altar on the battlefield
• available

Steps

1. Cast Breath of Life by paying , returning Karmic Guide from your graveyard to the battlefield
2. Karmic Guide and Preston trigger
3. In response, activate Phyreixan Altar by sacrificing Karmic Guide, adding
4. Resolve the Karmic Guide trigger, returning any creature from your graveyard to the battlefield
5. Resolve Preston's trigger, creating a 0/1 Illusion token copy of Karmic Guide
6. The token Karmic Guide enters the battlefield, returning the nontoken Karmic Guide from your graveyard to the battlefield
7. Repeat from step 2
8. Once you have infinite Illusion tokens and infinite mana, you may activate Preston any number of times

Results

• Exile any number of nonland permanents
• Infinite colored mana
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers