If you discard its Energy, it will be unable to attack
You want at least 6 such things and more just makes your Tinker more consistent
Crossceiver allows the player to put a Pokmon or Supporter card from their discard pile directly into their hand
Even if it doesn't win every game, few Magic: The Gathering players are sad to open a copy of Impact Tremors
Plus, the monetization of the title benefits from having these elements, as players will continue to buy packs until they get hold of the cards they want
And then you look down and its Ghostly Prison, Propaganda, Rhystic Study, Spelltithe Enforcer, Mystic Remora, Aura of Silence, and many other dorks and you have to deal with the difficulty of untapping in the face of Winter Orb, Rising Waters, Tangle Wire, and other effects