Goblin Welder + Sewer-veillance Cam

UR identity

Commander legal

The 2 combo pieces

• Goblin Welder
• Sewer-veillance Cam

How to execute it

1. Activate Goblin Welder by tapping it, causing you to sacrifice Sewer-veillance Cam and return another artifact from your graveyard to the battlefield.
2. Sewer-veillance Cam triggers, untapping Goblin Welder.
3. Activate Goblin Welder by tapping it, causing you to sacrifice the artifact returned in step 1 and return Sewer-veillance Cam from your graveyard to the battlefield.
4. When Sewer-veillance Cam enters, it triggers, untapping Goblin Welder.
5. Repeat.

What the combo produces

• Infinite creature LTB
• Infinite death triggers
• Infinite ETB
• Infinite recursion of artifact creatures you control
• Infinite sacrifice triggers