Magic is stuffed full of ways to copy instants and sorceries or let you recast them from the graveyard, so you can often cast this a few times in a game if you feel so inclined
Melmetal's first attack provides reliable energy acceleration for the deck , which synergizes with its second attack because the second attack deals 30 more damage for each Metal-type energy attached to the Pokmon
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The Pokmon w/ those following SP symbols are from Pokmon Platinum : Rising Rivals set
It is also one of the cleanest ways to turn all that Simic mana into a lethal swing
In terms of game range, I think it's easy to pair with black or green, but it's good that the Muraganda cycle of both is also strong in the end and worth retrieving