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
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
We can help our own cause a great deal by helping them draw, whether thats a little bit with Temple Bell or a great deal with Windfall
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
A few things worth knowing about how it works: The card stays in its existing PSA holder during review