Mikaeus, the Unhallowed + Warren Soultrader + Al Bhed Salvagers + Persist Creature

300

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How it works

Activate Warren Soultrader by paying 1 life and sacrificing the persist creature.
When the persist creature dies, its persist ability triggers if it didn't have a -1/-1 counter on it, and its undying ability triggers if it didn't have a +1/+1 counter on it. Al Bhed Salvagers also triggers regardless.
Resolve the Al Bhed Salvagers trigger, causing target opponent to lose 1 life and you to gain 1 life.
Resolve the persist trigger, if applicable, returning the creature from your graveyard to the battlefield with a -1/-1 counter on it.
Resolve the undying trigger, if applicable, returning the creature from your graveyard to the battlefield with a +1/+1 counter on it.
Resolve the Warren Soultrader ability, creating a Treasure token.
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.