Boonweaver Giant, Umbral Collar Zealot, and Unhallowed Pact

Prerequisites

• Boonweaver Giant on the battlefield
• Umbral Collar Zealot on the battlefield
• Unhallowed Pact on the battlefield

Steps

1. Activate Umbral Collar Zealot by sacrificing Boonweaver Giant When Boonweaver Giant dies, Unhallowed Pact triggers, returning Boonweaver Giant from your graveyard to the battlefield When Boonweaver Giant enters, it triggers, returning Unhallowed Pact from your graveyard to the battlefield attached to Boonweaver Giant
2. Resolve the Umbral Collar Zealot ability from step 1
3. Repeat

Results

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