With a PSA 10 supply of 24 and prices peaking at $177, it has become a desirable staple in competitive decks
Strategic Depth: Introduced cards like Great Catcher, an Item card that allowed players to switch their opponent's Benched Pokmon-GX or Pokmon-EX with their Active Pokmon, rewarding tactical play
[P][P][C] Deletion Sphere: 160+ damage
The comic book theme always appealed to me, and I always enjoyed how they made Fusions actually fun and interesting (Up until the various HERO archetypes came out I used to always avoid Fusion and Ritual monsters 'cause of their requirements of such specific cards), and one of my main decks right now when playing online is a HERO deck as well (Masked mostly, with some of the generic fusions and some synchros mixed in)
It's not that it can't be answered, but rather that it must be answered, or else your 2-drop's going to accelerate you into absurd late game spells a full half a game early
It is a useful out card that doubles up as a sort of win condition in the very very late game that makes up for its low power over much of the game with its high flexibility