Hit the Mother Lode + Mortuary + Skullwinder + Amulet of Vigor + Phyrexian Altar

Exhibition

How it works

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Activate Phyrexian Altar by sacrificing Skullwinder, adding .
When Skullwinder dies, Mortuary triggers, putting Skullwinder on top of your library from your graveyard.
Cast Hit the Mother Lode by paying , 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 .
Repeat.

In which brackets is this combo allowed, per Spellbook's Exhibition tier?

1–2 · Exhibition & Core

Allowed in this bracket.

3 · Upgraded

Allowed in this bracket.

4–5 · Optimized & cEDH

All combos are allowed.