Daretti, Rocketeer Engineer + Genesis Chamber + Phyrexian Metamorph

Exhibition

Decks

How it works

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Cast Daretti by paying .
When Daretti enters the battlefield, it and Genesis Chamber trigger.
Resolve the Genesis Chamber trigger, creating a 1/1 Myr artifact creature token.
Resolve the Daretti trigger, causing you to sacrifice the Myr to return Phyrexian Metamorph from your graveyard to the battlefield as a copy of Daretti.
Put Phyrexian Metamorph into your graveyard due to the legend rule.
Phyrexian Metamorph and Genesis Chamber trigger.
Resolve the Genesis Chamber trigger, creating a 1/1 Myr artifact creature token.
Resolve the Phyrexian Metamorph trigger, causing you to sacrifice the Myr to return Phyrexian Metamorph from your graveyard to the battlefield as a copy of Daretti.
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.