Danitha, Benalia's Hope + False Demise + Yahenni, Undying Partisan

Danitha, Benalia's Hope

False Demise

Yahenni, Undying Partisan

How it works

1. Activate Yahenni by sacrificing Danitha.
2. When Danitha dies, False Demise triggers, returning Danitha from your graveyard to the battlefield tapped.
3. When Danitha enters the battlefield, it triggers, returning False Demise from your graveyard to the battlefield attached to Danitha.
4. Resolve the Yahenni ability.
5. Repeat.