Stormfront Riders + Mana Echoes + Defiler of Faith + Essence Warden

How it works

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Cast Stormfront Riders by paying due to Defiler of Faith.
Defiler of Faith triggers, creating a 1/1 Soldier creature token.
When the Soldier enters, Mana Echoes and Essence Warden triggers.
Resolve the Mana Echoes trigger, adding for each Soldier you control.
Resolve the Essence Warden trigger, causing you to gain 1 life.
Resolve the Stormfront Riders spell. When it enters, it, Mana Echoes and Essence Warden trigger.
Resolve the Essence Warden trigger, causing you to gain 1 life.
Resolve the Stormfront Riders trigger, returning it and the Soldier token created in step 2 from the battlefield to your hand.
Stormfront Riders' second ability triggers twice.
Resolve a Stormfront Riders trigger, creating a 1/1 Soldier creature token.
Repeat steps 3 through 5 one additional time.
Repeat from step 10 for the remaining trigger.
Resolve the Mana Echoes trigger from step 6, adding for each Soldier you control.
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.