Hidetsugu and Kairi + Clone Legion + Mnemonic Wall

Decks

How it works

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Cast Clone Legion by paying , causing you to create a token copy of Hidetsugu and Kairi and Mnemonic Wall.
Put the token Hidetsugu and Kairi into your graveyard due to the legend rule.
The Hidetsugu and Kairi token's first and second abilities trigger, as well as Mnemonic Wall.
Resolve the Mnemonic Wall trigger, returning Clone Legion from your graveyard to your hand.
Resolve the first Hidetsugu and Kairi trigger, causing you to draw three cards and then put Clone Legion and another card on top of your library, ensuring Clone Legion is on top.
Resolve the second Hidetsugu and Kairi trigger, exiling Clone Legion from the top of your library, then causing an opponent to lose 9 life and allowing you to cast Clone Legion from exile without paying its mana cost.
Resolve Clone Legion, causing you to create a token copy of Hidetsugu and Kairi and Mnemonic Wall.
Repeat from step 2.

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.