Ratadrabik of Urborg, Boonweaver Giant, On Serra's Wings, and Yahenni, Undying Partisan

Prerequisites

• Ratadrabik of Urborg on the battlefield
• Boonweaver Giant on the battlefield
• On Serra's Wings on the battlefield
• Yahenni, Undying Partisan on the battlefield

Steps

1. Activate Yahenni by sacrificing Boonweaver Giant
2. When Boonweaver Giant dies as a legendary creature due to On Serra's Wings, Ratadrabik of Urborg triggers, creating a token copy of Boonweaver Giant that is a 2/2 Zombie in addition to its other types
3. When the Boonweaver Giant token enters the battlefield, it triggers, returning On Serra's Wings from your graveyard to the battlefield attached to the token
4. Resolve the Yahenni ability, giving it indestructible until end of turn
5. Repeat

Results

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