Sanar, Unfinished Genius // Wild Idea + Skycoach Waypoint + Nexus of Fate

Decks

How it works

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If Sanar isn't prepared, activate Skycoach Waypoint's second ability by paying and tapping it, causing Sanar to become prepared.
If Nexus of Fate is in your library, cast a copy of Wild Idea by paying , searching your library for Nexus of Fate and putting it into your hand.
If Sanar doesn't have summoning sickness, activate it by tapping it, creating a Treasure token. Then, activate the Treasure by tapping and sacrificing it, adding .
Cast Nexus of Fate by paying its mana cost, causing you to take an extra turn after this one and shuffle Nexus of Fate into your library.
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.