Ao, the Dawn Sky + Mortuary + Phantasmal Image

Ao, the Dawn Sky

Mortuary

Phantasmal Image

How it works

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