You can build Turboland decks that feel like Storm, both in play patterns and in how narrow their cards are, or you can have the usual ramp payoffs attained through actual land count rather than mana rocks or creatures (suggesting a land subtheme grafted into a 'normal' deck)
It puts your basic/cave directly into play, so you could argue over which is better, but my gut instinct is usually that something lower on the curve fits into more homes
It will be knocked out, but Chansey will receive 80 damage, leaving 20 HP left
Players can find a full description of character cards on page 5 of the rulebook
While its definitely helpful to have access to the rarer cards in a deck, its also fully possible to play a competitive deck without Legendary cards and just a few Rare and Super Rare
And maybe, just maybe, your opponents lose before you do