The lid of the Omnihive 1000+ Xenoskin is secured with strong magnets and an additional ZnapClaw mechanism.
If an effect instructs you to choose a card name, you may choose one of those names, but not all of them (though you might want to write it down and not just say it out loud)
The Challenger keyword boosts their strength - allowing them to damage an opponent by an extra two points - while Resist reduces the damage received in return by two, making it less costly to send the selected character into a challenge
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Have a look at the list here.
For how much Garfield and Magics other core designers didnt yet understand about the future of the game, the reasoning for this was simple, and showed a tremendous amount of foresight: adding more and more cards to a single card pool would, in Garfields own words, collapse the game into complexity and would strongarm players into buying cards they might not want. Hmm