Ascend from Avernus + Dockside Extortionist + Sidisi, Undead Vizier + Riftsweeper + Ashnod's Altar

Banned

€----

How it works

Cast Dockside Extortionist by paying .
Dockside Extortionist enters the battlefield, creating at least five Treasure tokens.
Activate two Treasure tokens by tapping and sacrificing them, adding .
Activate Ashnod's Altar twice by sacrificing Dockside Extortionist and Riftsweeper, adding .
Cast Sidisi by paying .
Sidisi enters the battlefield, exploiting itself.
Sidisi triggers, searching your library for Ascend for Avernus and putting it into your hand.
Activate three Treasure tokens by tapping and sacrificing them, adding .
Cast Ascend from Avernus by paying , returning Sidisi, Riftsweeper, and Dockside Extortionist from your graveyard to the battlefield, and exiling Ascend from Avernus.
Sidisi, Riftsweeper, and Dockside Extortionist enter the battlefield, triggering their abilities.
Resolve the Dockside Extortionist trigger, creating at least five Treasure tokens.
Resolve the Riftsweeper trigger, shuffling Ascend from Avernus into your library from exile.
Holding priority, activate Ashnod's Altar twice by sacrificing Dockside Extortionist and Riftsweeper, adding .
Activate a Treasure token by tapping and sacrificing it, adding .
Resolve the Sidisi trigger from step 10, exploiting itself.
Repeat from step 7.

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

1–2 · Exhibition & Core

Spellbook classifies this as Banned — not for these brackets.

3 · Upgraded

Spellbook classifies this as Banned — not for these brackets.

4–5 · Optimized & cEDH

Spellbook classifies this as Banned — not for these brackets.