Ratadrabik of Urborg, Sarkhan, the Dragonspeaker, and Yahenni, Undying Partisan

Prerequisites

• Ratadrabik of Urborg on the battlefield
• Sarkhan, the Dragonspeaker on the battlefield
• Yahenni, Undying Partisan on the battlefield

Steps

1. Activate Sarkhan's first loyalty ability by putting a loyalty counter on it, causing it to become a legendary 4/4 Dragon creature with flying, indestructible and haste
2. Activate Yahenni by sacrificing Sarkhan
3. When Sarkhan dies, Ratadrabik triggers, creating a token copy of Sarkhan that isn't legendary
4. Resolve the Yahenni ability
5. Repeat using the Sarkhan token

Results

• Infinite LTB
• Infinite sacrifice triggers
• Infinite death triggers