Beacon of Immortality + Bolas's Citadel + Thought Lash

Decks

How it works

Your life total is at least 12 if Beacon of Immortality is in your library, or you have available if it's in your hand.

Activate Thought Lash by exiling the top card of your library.
Repeat step 1 until you either exile your library or have Beacon of Immortality on top of your library.
Resolve all Thought Lash abilities.
Cast Beacon of Immortality either from your hand by paying or from the top of your library by paying 6 life, doubling your life total and shuffling it into your library.
If Beacon of Immortality is not on top of your library, repeat from step 1. Otherwise, repeat step 4.

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.