Boonweaver Giant, Phyrexian Altar, and Unhallowed Pact

Prerequisites

• Boonweaver Giant on the battlefield
• Phyrexian Altar on the battlefield
• Unhallowed Pact on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing Boonweaver Giant When Boonweaver Giant dies, Unhallowed Pact triggers, returning Boonweaver Giant from your graveyard to the battlefield tapped
2. When Boonweaver Giant enters, it triggers, returning Unhallowed Pact from your graveyard to the battlefield attached to Boonweaver Giant
3. Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite colored mana
• Infinite death triggers
• Infinite sacrifice triggers