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

Prerequisites

• Golbez, Crystal Collector on the battlefield
• Copy Catchers in hand
• Mycosynth Lattice on the battlefield
• Ashnod's Altar on the battlefield
• available

Steps

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

Results

• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite sacrifice triggers
• Infinite surveil