Kykar, Zephyr Awakener + Temporal Manipulation + The Immortal Weapons

How it works

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Cast Temporal Manipulation by paying its mana cost.
Kykar triggers, exiling The Immortal Weapons.
Resolve Temporal Manipulation, causing you to take an extra turn after this one.
At the beginning of your end step, Kykar triggers, returning The Immortal Weapons from exile to the battlefield.
When The Immortal Weapons 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.