Preston, the Vanisher, Fiend Hunter, Ephemerate, and Phyrexian Altar

Prerequisites

• Preston, the Vanisher on the battlefield
• Fiend Hunter on the battlefield
• Ephemerate in hand
• Phyrexian Altar on the battlefield
• available

Steps

1. Cast Ephemerate by paying , blinking Fiend Hunter
2. Fiend Hunter enters the battlefield, triggering itself and Preston
3. Resolve the Fiend Hunter trigger, choosing not to exile a creature
4. Resolve the Preston trigger, creating a token copy of Fiend Hunter that is a 0/1 white Illusion
5. The Fiend Hunter token enters the battlefield, exiling the nontoken Fiend Hunter
6. Activate Phyrexian Altar sacrificing the Fiend Hunter token, adding one mana of any color
7. The token dies, returning the nontoken Fiend Hunter from exile to the battlefield
8. Repeat from step 2

Results

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