Boonweaver Giant + Unholy Indenture + Yahenni, Undying Partisan

Boonweaver Giant

Unholy Indenture

Yahenni, Undying Partisan

How it works

1. Activate Yahenni by sacrificing Boonweaver Giant
2. When Boonweaver Giant dies, Unholy Indenture triggers, returning Boonweaver Giant from your graveyard to the battlefield
3. When Boonweaver Giant enters, it triggers, returning Unholy Indenture from your graveyard to the battlefield attached to Boonweaver Giant.
4. Resolve the Yahenni ability from step 1.
5. Repeat.