Bolas's Citadel, Beacon of Immortality, and Phyrexian Devourer

Prerequisites

• Bolas's Citadel on the battlefield
• Beacon of Immortality in hand or in the library
• Phyrexian Devourer on the battlefield
• You have at least 6 life
• Note that mana and life prerequisite are different if Beacon of Immortality starts on top of your library
• available

Steps

1. Activate Phyrexian Devourer repeatedly while holding priority by exiling your library
2. Cast Beacon of Immortality by paying , doubling your life total and shuffling Beacon of Immortality into your empty library
3. Cast Beacon of Immortality from the top of your library by paying 6 life, doubling your life total and shuffling Beacon of Immortality into your empty library
4. Repeat any number of times
5. Resolve all remaining Phyrexian Devourer abilities and resulting Phyrexian Devourer triggered abilities, sacrificing Phyrexian Devoruer
6. If you have at least 7 life, this combo results in infinite lifegain

Results

• Exile your library
• Infinite lifegain
• Infinite lifegain triggers
• Infinite magecraft triggers
• Infinite storm count