Prerequisites
- Goblin Welder on the battlefield
- Corridor Monitor in the graveyard
- Dross Scorpion on the battlefield
- Liquimetal Coating on the battlefield
- Goblin Welder does not have summoning sickness
Steps
- Activate Liquimetal Coating by tapping it, causing Goblin Welder to become an artifact in addition to its other types until end of turn
- Activate Goblin Welder by tapping it, sacrificing Dross Scorpion and returning Corridor Monitor from your graveyard to the battlefield
- Dross Scorpion and Corridor Monitor trigger
- Resolve the Dross Scorpion trigger, untapping Goblin Welder
- Holding priority, activate Goblin Welder by tapping it, sacrificing Corridor Monitor and returning Dross Scorpion from your graveyard to the battlefield
- Resolve the Corridor Monitor trigger from step 2, untapping Goblin Welder
- Repeat from step 2
Results
Required Cards 4
Goblin Welder
Creature — Goblin Artificer
Corridor Monitor
Artifact Creature — Construct
Dross Scorpion
Artifact Creature — Scorpion