Meria, Scholar of Antiquity + Sensei's Divining Top + Weapons Manufacturing + Ravenous Robots + Glaring Fleshraker

Decks

How it works

Activate Sensei's Divining Top's second ability by tapping it, causing you to draw a card and put Sensei's Divining Top from the battlefield onto the top of your library.
Activate Meria's second ability by tapping two artifacts, exiling Sensei's Divining Top with the ability to play it until end of turn.
Cast Sensei's Divining Top from exile by paying
Ravenous Robots and Glaring Fleshraker's first ability trigger.
Resolve the Ravenous Robots trigger, creating a 1/1 Robot artifact creature token.
When the Robot enters, Glaring Fleshraker's second ability triggers, dealing 1 damage to each opponent.
Resolve the Glaring Fleshraker trigger, creating a 0/1 Eldrazi Spawn creature token.
When the Eldrazi Spawn enters, Glaring Fleshraker's second ability triggers, dealing 1 damage to each opponent.
Activate the Eldrazi Spawn by sacrificing it, adding .
Resolve Sensei's Divining Top. When it enters, Weapons Manufacturing triggers, creating a Munitions token.
Repeat.

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

1–2 · Exhibition & Core

Allowed in this bracket.

3 · Upgraded

Allowed in this bracket.

4–5 · Optimized & cEDH

All combos are allowed.