Boonweaver Giant + Gift of Immortality + Yahenni, Undying Partisan

Boonweaver Giant

Gift of Immortality

Yahenni, Undying Partisan

How it works

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