Goblin Welder + Unbender Tine + Dross Scorpion + Liquimetal Coating

Goblin Welder

Unbender Tine

Dross Scorpion

Liquimetal Coating

How it works

1. Activate Liquimetal Coating by tapping it, causing Goblin Welder to become an artifact in addition to its other types until end of turn.
2. Activate Goblin Welder by tapping it, sacrificing Dross Scorpion and returning Unbender Tine from your graveyard to the battlefield.
3. Dross Scorpion triggers, untapping Goblin Welder.
4. Activate Unbender Tine by tapping it, targeting Goblin Welder.
5. Holding priority, activate Goblin Welder by tapping it, sacrificing Unbender Tine and returning Dross Scorpion from your graveyard to the battlefield.
6. Resolve the Unbender Tine ability, untapping Goblin Welder.
7. Repeat from step 2.