Although it is a 3-card combo, it seems like a decent combo since it only requires 2 lands and 1 three-mana card, and the mana required is also low
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The only issue Metalworker has it that it's a creature and can be killed before you use it
If possible, putting it under the EX zone will create room for securing a lot of mutual links, but since it is a link 4, should it be considered that it can be used anywhere when it can be used