Atla Palani, Nest Tender, Shilgengar, Sire of Famine, and Xenograft

Prerequisites

• Atla Palani, Nest Tender on the battlefield
• Shilgengar, Sire of Famine on the battlefield
• Xenograft on the battlefield

Steps

1. Activate Shilgengar by sacrificing another creature
2. When the creature dies as an Egg due to Xenograft, Atla triggers, revealing a creature card from your library and putting it onto the battlefield
3. Resolve the Shilgengar ability
4. Repeat as desired / able

Results

• Near-infinite Blood tokens
• Near-infinite ETB
• Near-infinite LTB
• Near-infinite death triggers
• Near-infinite sacrifice triggers
• Put all creature cards in your library onto the battlefield, then into your graveyard