Golbez, Crystal Collector + Copy Catchers + Mycosynth Lattice + Ashnod's Altar

How it works

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Cast Copy Catchers by paying .
When Copy Catchers enters as an artifact due to Mycosynth Lattice, Golbez's first ability triggers, causing you to surveil 1.
Copy Catchers triggers, causing you to pay to create a token copy of it.
When the token Copy Catchers enters as an artifact due to Mycosynth Lattice, Golbez's first ability triggers, causing you to surveil 1.
Both Copy Catchers trigger. Resolve the first trigger, choosing not to pay.
Holding priority, activate Ashnod's Altar by sacrificing the Copy Catchers token, adding .
Resolve the remaining Copy Catchers trigger, causing you to pay to create a token copy of it.
Repeat from step 4.

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.