Sidisi, Regent of the Mire + Sister Hospitaller + Thornbite Staff + Phantom Train

Sidisi, Regent of the Mire

Sister Hospitaller

Thornbite Staff

Phantom Train

How it works

1. Activate Sidisi by tapping it and sacrificing a nontoken creature with mana value 5.
2. When the creature dies, Sidisi triggers, untapping Sidisi.
3. Resolve the Sidisi ability, returning Sister Hospitaller from your graveyard to the battlefield.
4. When Sister Hospitaller enters the battlefield, it triggers, returning the creature with mana value 5 from your graveyard to the battlefield and causing you to gain 5 life.
5. Activate Phantom Train by sacrificing Sister Hospitaller.
6. When Sister Hospitaller dies, Sidisi triggers, untapping Sidisi.
7. Resolve the Phantom Train ability.
8. Repeat.