Sidisi, Regent of the Mire + Sister Hospitaller + Umbral Collar Zealot + Sky Hussar

Sidisi, Regent of the Mire

Sister Hospitaller

Umbral Collar Zealot

Sky Hussar

How it works

1. Activate Sidisi by tapping it and sacrificing Sky Hussar, returning Sister Hospitaller from your graveyard to the battlefield.
2. When Sister Hospitaller enters the battlefield, it triggers, returning Sky Hussar from your graveyard to the battlefield and causing you to gain 5 life.
3. When Sky Hussar enters the battlefield, it triggers, untapping all creatures.
4. Activate Umbral Collar Zealot by sacrificing Sister Hospitaller.
5. Repeat.

This looping engine dances between the graveyard and the battlefield by leveraging Sidisi, Regent of the Mire to continuously trade up in mana value. When you sacrifice Sky Hussar to Sidisi's activated ability, you can pull Sister Hospitaller out of your graveyard, whose enters-the-battlefield trigger promptly brings Sky Hussar right back while padding your life total. Meanwhile, Umbral Collar Zealot serves as the vital sacrifice outlet to send Sister Hospitaller back to the graveyard so the cycle can repeat indefinitely, generating an endless stream of triggers and untaps.