Emry, Lurker of the Loch, Sewer-veillance Cam, and Extruder

Prerequisites

• Emry, Lurker of the Loch on the battlefield
• Sewer-veillance Cam in the graveyard
• Extruder on the battlefield

Steps

1. Activate Emry by tapping it, allowing you to cast Sewer-veillance Cam from your graveyard this turn
2. Activate a creature by tapping it, adding at least
3. Cast Sewer-veillance Cam from your graveyard by paying
4. When Sewer-veillance Cam enters, it triggers, untapping Emry
5. Activate Extruder by sacrificing Sewer-veillance Cam
6. Sewer-veillance Cam triggers, untapping the mana-producing creature
7. Resolve the Extruder ability
8. Repeat

Results

• Infinite +1/+1 counters on creatures you control
• Infinite storm count