Boonweaver Giant, Yahenni, Undying Partisan, and Gift of Immortality

Prerequisites

• Boonweaver Giant on the battlefield
• Yahenni, Undying Partisan on the battlefield
• Gift of Immortality on the battlefield

Steps

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

Results

• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite sacrifice triggers