You can play her to stop your opponent from banishing your best characters, buying you a turn or two to prepare your next move
Additionally, we can cast it from exile on a later turn for its full mana cost
But the traditional experience of playing a TCG can only come from engaging with other people in your community folks who might have different cards, different decks, and different strategies that youre not familiar with
Thats obviously an inflammatory way to put it
Another example would be the prerelease version of Misty's Seadra from the Gym Heroes Expansion
When you can play it the Cloud brings awesome power offering a pretty good representation of a Mind Twist, an Armageddon, a Wrath of God or a Fireball, often a couple of those things and almost always far worse for your opponent than you