Sister Hospitaller + Yahenni, Undying Partisan + Icewind Stalwart

Sister Hospitaller

Yahenni, Undying Partisan

Icewind Stalwart

How it works

1. Cast Icewind Stalwart by paying its mana cost.
2. When Icewind Stalwart enters the battlefield, it triggers, targeting Sister Hospitaller
3. Holding priority, activate Yahenni by sacrificing Icewind Stalwart.
4. Resolve the Icewind Stalwart ability, blinking Sister Hospitaller
5. When Sister Hospitaller enters, it triggers, returning Icewind Stalwart from your graveyard to the battlefield.
6. Repeat from step 2.