Kykar, Zephyr Awakener + Temporal Manipulation + Mnemonic Wall

Decks

How it works

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Cast Temporal Manipulation by paying its mana cost.
Kykar triggers, exiling Mnemonic Wall.
Resolve Temporal Manipulation, causing you to take an extra turn after this one.
At the beginning of your end step, Kykar triggers, returning Mnemonic Wall from exile to the battlefield.
When Mnemonic Wall enters, it triggers, returning Temporal Manipulation from your graveyard to your hand.
Repeat each turn.

In which brackets is this combo allowed, per Spellbook's Ruthless tier?

1–2 · Exhibition & Core

Spellbook classifies this as Ruthless — not for these brackets.

3 · Upgraded

Spellbook classifies this as Ruthless — not for these brackets.

4–5 · Optimized & cEDH

All combos are allowed.