Bolas's Citadel, Beacon of Immortality, and Mirror of Fate

Prerequisites

• Bolas's Citadel on the battlefield
• Beacon of Immortality in hand or in the library
• Mirror of Fate 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 Mirror of Fate by tapping it and sacrificing it, exiling your library without placing any face-up exiled cards you own on top of 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
5. 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