Sister Hospitaller, Phyrexian Altar, and Hostage Taker

Prerequisites

• Sister Hospitaller in hand
• Phyrexian Altar on the battlefield
• Hostage Taker in the graveyard
• available

Steps

1. Cast Sister Hospitaller by paying
2. When Sister Hospitaller enters, it triggers, returning Hostage Taker from your graveyard to the battlefield and causing you to gain life equal to its mana value
3. When Hostage Taker enters, it triggers, exiling Sister Hospitaller until Hostage Taker leaves the battlefield
4. Activate Phyrexian Altar by sacrificing Hostage Taker
5. When Hostage Taker leaves the battlefield, Sister Hospitaller is returned from exile to the battlefield
6. Repeat from step 2

Results

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