Ao, the Dawn Sky, Mortuary, and Clever Impersonator

Prerequisites

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

Steps

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

Results

• Infinite LTB
• Infinite ETB
• Infinite death triggers