When Mnemonic Wall dies, Mortuary triggers, putting Mnemonic Wall on top of your library from your graveyard.
Cast Hit the Mother Lode by paying ({4} magic symbol) ({R} magic symbol) ({R} magic symbol) ({R} magic symbol) , exiling Mnemonic Wall from the top of your library and casting it without paying its mana cost, and creating five tapped Treasure artifact tokens.
When Mnemonic Wall and the Treasures enter the battlefield, Amulet of Vigor triggers five times and Mnemonic Wall triggers once.
Resolve all Amulet of Vigor triggers, untapping the Treasures.
Resolve the Mnemonic Wall trigger, returning Hit the Mother Lode from your graveyard to your hand.
Activate five Treasures by tapping and sacrificing them, adding ({2} magic symbol) ({R} magic symbol) ({R} magic symbol) ({R} magic symbol) .