It's just the same for the actual game here itself: it's a pocket-sized version of the Pokmon Trading Card Game
So while some decks might struggle to produce a big payoff from an X spell, green strategies are often well suited to produce lots of mana in a short amount of time, allowing cards like Invasion of Ikoria to suddenly apply pressure with whatever creature is going to be the best solution to a given situation
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If this is activated, you can tribute a Dark Magician/Dark Magician Girl and special summon a Dark Magician or Dark Magician Girl from your hand or graveyard, then negate the effect/activation of the original targeted card
The activated ability gives you options of lifegain, counters, direct damage to flying creatures, or even some mill protection
To get an idea of how valuable Pokemon cards became, we could look at Dani Sanchez or SuperDuperDani