When Skullwinder dies, Mortuary triggers, putting Skullwinder 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 Skullwinder from the top of your library and casting it without paying its mana cost, and creating seven tapped Treasure artifact tokens.
When Skullwinder and the Treasures enter the battlefield, Amulet of Vigor triggers seven times and Skullwinder triggers once.
Resolve all Amulet of Vigor triggers, untapping the Treasures.
Resolve the Skullwinder trigger, returning Hit the Mother Lode from your graveyard to your hand, and allowing an opponent to return a card from their graveyard to their hand.
Activate six Treasures by tapping and sacrificing them, adding ({4} magic symbol) ({R} magic symbol) ({R} magic symbol) .
Repeat.
Results
Infinite colored mana.
Infinite death triggers.
Infinite ETB.
Infinite LTB.
Infinite magecraft triggers.
Infinite sacrifice triggers.
Infinite storm count.
Infinite Treasure tokens.
Target opponent returns all cards in their graveyard to their hand.