Restoration Angel, Sister Hospitaller, and Phantom Train

Prerequisites

• Restoration Angel in hand
• Sister Hospitaller on the battlefield
• Phantom Train on the battlefield
• available

Steps

1. Cast Restoration Angel by paying its mana cost
2. When Restoration Angel enters the battlefield, it triggers, targeting Sister Hospitaller Holding priority, activate Phantom Train by sacrificing Restoration Angel
3. Resolve the Restoration Angel ability, blinking Sister Hospitaller When Sister Hospitaller enters, it triggers, returning Restoration Angel from your graveyard to the battlefield
4. Repeat from step 2

Results

• Infinite creature LTB
• Infinite creature ETB
• Infinite creature sacrifice triggers
• Infinite death triggers
• Infinite +1/+1 counters on a creature
• Infinite lifegain triggers
• Infinite lifegain