Plea for Power + Illusion of Choice + Scholar of the Ages + Brago, King Eternal

Decks

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How it works

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Cast Illusion of Choice by paying , allowing you to decide how each player votes this turn and causing you to draw a a card.
Cast Plea for Power by paying , choosing all votes to be for time, causing you to take an extra turn after this one.
Deal combat damage to an opponent using Brago. Brago triggers, blinking Scholar of the Ages.
When Scholar of the Ages enters the battlefield, it triggers, returning Illusion of Choice and Plea for Power 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.