Displacer Kitten + Mana Echoes + Strife Scholar // Awaken the Ages + Urn of Godfire

How it works

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Cast the copy of Awaken the Ages from exile by paying its mana cost.
When you cast that spell, Displacer Kitten triggers, flickering Strife Scholar, which enters prepared.
When Strife Scholar enters, Mana Echoes triggers, adding at least .
Resolve the spell from step 1, creating two 2/2 Spirit creature tokens.
When the tokens enter, Mana Echoes triggers for each of them, adding a total of at least .
Pay an additional to repeat steps 1 through 5 an additional time, this time adding nine .
Activate Urn of Godfire by paying , adding one colored mana.
Repeat steps 1 through 5 and step 7 any number of times.

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.