Ashnod the Uncaring, Whisper, Blood Liturgist, and Fervor

Prerequisites

• Ashnod the Uncaring on the battlefield
• Whisper, Blood Liturgist on the battlefield
• Fervor on the battlefield

Steps

1. Activate Whisper by tapping and sacrificing it and another nontoken creature you control, targeting any applicable creature card in your graveyard
2. Ashnod triggers, copying Whisper's ability, targeting Whisper
3. Resolve both Whisper abilities, returning Whisper and another creature from your graveyard to the battlefield
4. Repeat

Results

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