Two or more players build custom decks of cards featuring Disney heroes, villains, items, and songs, then use those cards to battle (through challenges) or quest for lore
The game gives you a great selection of free cards/decks to play with, and you can always expand upon your collection here at the PoTown store
With a big enough army, you can push through all your opponents' defenses to poison out all your opponents in a single turn
Specifically, any legendary Vehicle or Spacecraft card with a printed power and toughness can now be your commander
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