Boonweaver Giant, Yahenni, Undying Partisan, and Necrogen Communion

Prerequisites

• Boonweaver Giant on the battlefield
• Yahenni, Undying Partisan on the battlefield
• Necrogen Communion on the battlefield

Steps

1. Activate Yahenni by sacrificing Boonweaver Giant When Boonweaver Giant dies, Necrogen Communion triggers, returning Boonweaver Giant from your graveyard to the battlefield When Boonweaver Giant enters, it triggers, returning Necrogen Communion 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