Activate Ashnod's Altar by sacrificing Shipwreck Dowser, adding CC.
When Shipwreck Dowser dies, Mortuary triggers, putting Shipwreck Dowser on top of your library from your graveyard.
Cast Hit the Mother Lode by paying 4, exiling Shipwreck Dowser from the top of your library and casting it without paying its mana cost, and creating five tapped Treasure artifact tokens.
When Shipwreck Dowser and the Treasures enter the battlefield, Amulet of Vigor triggers five times and Shipwreck Dowser's second ability triggers once.
Resolve all Amulet of Vigor triggers, untapping the Treasures.
Resolve the Shipwreck Dowser trigger, returning Hit the Mother Lode from your graveyard to your hand.
Activate five Treasures by tapping and sacrificing them, adding 2.
Repeat.
This intricate engine turns the chaotic potential of Hit the Mother Lode into a self-sustaining loop by manipulating your library's top card. When you cast Hit the Mother Lode, its discover mechanic reliably hits Shipwreck Dowser right off the top, deploying it alongside a cluster of tapped Treasure tokens. Thanks to Amulet of Vigor, those Treasures instantly untap upon entry, providing the precise mana needed to recast your sorcery while Shipwreck Dowser's entrance ability plucks it right back out of the graveyard. The true glue of the operation is Mortuary, which ensures Shipwreck Dowser goes straight back to the top of your library the moment Ashnod's Altar sends it to the graveyard for colorless mana, ready to be discovered all over again.