Optimus Prime, Hero // Optimus Prime, Autobot Leader, Valkyrie's Call, and Krark-Clan Grunt

Prerequisites

• Optimus Prime, Hero // Optimus Prime, Autobot Leader on the battlefield
• Valkyrie's Call on the battlefield
• Krark-Clan Grunt on the battlefield

Steps

1. Activate Krark-Clan Grunt by sacrificing Optimus Prime, Hero
2. When Optimus Prime, Hero dies, its second ability triggers, returning it from your graveyard to the battlefield as Optimus Prime, Autobot Leader
3. Activate Krark-Clan Grunt by sacrificing Optimus Prime, Autobot Leader
4. When Optimus Prime, Autobot Leader dies, Valkyrie's Call triggers, returning Optimus Prime from your graveyard to the battlefield as Optimus Prime, Hero as an Angel with flying
5. Resolve both Krark-Clan Grunt abilities from steps 1 and 3
6. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinitely powerful Krark-Clan Grunt until end of turn