You can hit your opponent with a hand trap during your turn, attach it to this card as a material straight away, and then use it to negate your opponents hand trap during their turn
By the time of Sword and Shield , there were over 300 Black Star Promo cards made in that generation alone
Birds of Paradise and Sliver Legion are both high-value cards, so having two of them in one drop gives you more than enough to get a lot of value out of it
When evolved, Magnezone becomes a heavy hitter with Magnetic Storm for 110 damage using 3 energy most of which it can self-generate
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If that's not enough, the card even sticks around to regrow your best spell, and to turn into its own win condition if the game goes super long