According to the lore text at the bottom of the card, the creatures are trapped on a rock (possibly an asteroid.) Someone left behind an encrypted log recording the existence of slivers, either an unlucky explorer or, perhaps, a scientist involved in experimenting with the creatures, which would be a nice callback to the Riptide Project
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The +1/+1 counters dont do anything at first because the artifact isnt a creature
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Some of the reasons include the availability of the franchise around the world, the consistency of the whole concept and the kid-friendly idea that was completely new and original when it first came out (although it had some similar predecessors)
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