It gives you a cheap, small damage sweeper in the early game, or you can foretell it to be a more impactful sweeper later on
I certainly have been having tons of success with blue, but the format is quite well balanced, so every color has multiple good decks you can get into
For example, copying Goblin Electromancer will result in a 2-mana discount to all your instant and sorcery spells
Back when people played for ante (and in current 5-Color Magic ), this card alone would win game after game after game
You can hold this up for your opponents turns, and you can activate it multiple times
With nearly thirty years of history, Magic: The Gathering has many casual and competitive MTG formats