Atla Palani, Nest Tender, Phyrexian Altar, and Leyline of Transformation

Prerequisites

• Atla Palani, Nest Tender on the battlefield
• Phyrexian Altar on the battlefield
• Leyline of Transformation on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing another creature
2. When the creature dies as an Egg due to Leyline of Transformation, Atla triggers, revealing a creature card from your library and putting it onto the battlefield
3. Repeat as desired / able

Results

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