Boonweaver Giant, Umbral Collar Zealot, and Kaya's Ghostform

Prerequisites

• Boonweaver Giant on the battlefield
• Umbral Collar Zealot on the battlefield
• Kaya's Ghostform on the battlefield

Steps

1. Activate Umbral Collar Zealot by sacrificing Boonweaver Giant When Boonweaver Giant dies, Kaya's Ghostform triggers, returning Boonweaver Giant from your graveyard to the battlefield When Boonweaver Giant enters, it triggers, returning Kaya's Ghostform 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