Tangleroot + Words of Wind + Crimson Kobolds + Soul of the Harvest

Decks

How it works

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Cast Crimson Kobolds by paying .
Tangleroot triggers, adding .
When Crimson Kobolds enters the battlefield, Soul of the Harvest triggers.
Holding priority, activate Words of Wind by paying , replacing the next card you draw.
Resolve the Soul of the Harvest trigger, causing you to return Crimson Kobolds from the battlefield to your hand, and causing each opponent to return a permanent they control from the battlefield to your hand.
Repeat.

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.