Preston, the Vanisher, Karmic Guide, Ephemerate, and Phyrexian Altar

Prerequisites

• Preston, the Vanisher on the battlefield
• Karmic Guide on the battlefield
• Ephemerate in hand
• Phyrexian Altar on the battlefield
• available

Steps

1. Cast Ephemerate by paying , blinking Karmic Guide
2. Karmic Guide enters the battlefield, triggering itself and Preston
3. Resolve the Karmic Guide trigger, returning any creature card from your graveyard to the battlefield
4. Activate Phyrexian Altar by sacrificing Karmic Guide, adding one mana of any color
5. Resolve the Preston trigger from step 2, creating a token copy of Karmic Guide that is a 0/1 white Illusion
6. The Karmic Guide token enters the battlefield, returning the nontoken Karmic Guide from your graveyard to the battlefield
7. Repeat from step 2

Results

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