Inverter of Truth + Thassa's Oracle + Titans' Nest

Powerful

Decks

How it works

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Activate Titan's Nest by exiling a card from your graveyard, adding that can only be spent to cast a colored spell that does not have in its mana cost.
Repeat step 1 until you have an empty library.
Cast Inverter of Truth by paying .
When Inverter of Truth enters the battlefield, it triggers, exiling your library.
Cast Thassa's Oracle by paying .
When Thassa's Oracle enters the battlefield, it triggers, causing you to win the game.

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

1–2 · Exhibition & Core

Spellbook classifies this as Powerful — not for these brackets.

3 · Upgraded

Allowed in this bracket.

4–5 · Optimized & cEDH

All combos are allowed.