Flitwing, Lyev Detective, Ulvenwald Mysteries, and Extruder

Prerequisites

• Flitwing, Lyev Detective on the battlefield
• Ulvenwald Mysteries on the battlefield
• Extruder on the battlefield

Steps

1. Activate Extruder by sacrificing a Clue
2. Ulvenwald Mysteries' second ability triggers, creating a Clue token due to Flitwing
3. Resolve the Extruder ability, putting a +1/+1 counter on a creature Repeat

Results

• Infinite +1/+1 counters on creatures you control
• Infinite artifact ETB
• Infinite artifact LTB
• Infinite artifact sacrifice triggers