Vilis, Broker of Blood + Words of Worship + Channel

How it works

Cast Channel by paying .
Use Channel's ability by paying 1 life, adding .
When you lose life, Vilis triggers.
In response, activate Words of Worship by paying , creating a replacement effect.
Resolve the Vilis trigger, causing you to gain 5 life instead of drawing a card due to the replacement effect.
Repeat from step 2 any number of times.
Once you have gained an arbitrarily high amount of life, you may use Channel's ability any number of times, adding colorless mana and drawing cards with Vilis.
Once you have drawn your library, you will have for each card drawn this way.
You can then continue to use Channel, adding infinite , as long as you have drawn a way to remove Vilis or can use the mana to win at instant speed before Vilis's triggers resolve and cause you to lose by drawing from an empty library.

In which brackets is this combo allowed, per Spellbook's Banned tier?

1–2 · Exhibition & Core

Spellbook classifies this as Banned — not for these brackets.

3 · Upgraded

Spellbook classifies this as Banned — not for these brackets.

4–5 · Optimized & cEDH

Spellbook classifies this as Banned — not for these brackets.