Adarkar Valkyrie, and Teardrop Kami

Prerequisites

• Adarkar Valkyrie on the battlefield
• Teardrop Kami on the battlefield
• Adarkar Valkyrie does not have summoning sickness

Steps

1. Activate Adarkar Valkyrie by tapping it, targeting Teardrop Kami
2. Activate Teardrop Kami by sacrificing it
3. Teardrop Kami dies, triggering Adarkar Valkyrie, returning Teardrop Kami from your graveyard to the battlefield
4. Resolve the Teardrop Kami ability, untapping Adarkar Valkyrie
5. Repeat

Results

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