Ao, the Dawn Sky, Mortuary, and Clone

Prerequisites

• Ao, the Dawn Sky on the battlefield
• Mortuary on the battlefield
• Clone in hand
• available

Steps

1. Cast Clone by paying its mana cost
2. Choose to have it enter the battlefield as a copy of Ao
3. Put Clone into your graveyard due to the legend rule
4. When Clone dies, it and Mortuary trigger
5. Resolve the Mortuary trigger, putting Clone from your graveyard onto the top of your library
6. Resolve the Clone trigger, causing you to look at the top seven cards of your library and put Clone onto the battlefield as a copy of Ao
7. Repeat from step 2

Results

• Infinite LTB
• Infinite ETB
• Infinite death triggers