since this set is about commanders, lets start with them instead
They do nothing against mono color decks unless Richard is building the manabase, but against multicolor decks they can often be free wins and are definitely the highest win % cards for their mana values
Apparently, the multiverse has caused an event known as The Great Pruning, in which most planeswalker sparks have vanished: It was the Multiverse's attempt to heal itself from the Phyrexian invasion, the artificial portals created by Realmbreaker, and the explosion of the Sylex in the Blind Eternities when Elspeth snatched it from Jace
Setting Up Your First Game: Simple Pokmon TCG Setup Lets set up a game
And even in a random build, getting this lady out early will make the jerk who plans on using that Sol Ring to leap way ahead slow their roll and play at the same speed as everyone else
As for specifics, a recent Pokmon blog post confirmed some of the highlights from the expansion