The real power is when youre able to pump ten or more mana into it, buffing all your creatures and giving them all haste for the turn including the creature you searched your library for.
Their interventions are to be expected, but some game actions are less appreciated than others
Similar to Mythic Rares in Magic: The Gathering , theyre not guaranteed in any booster pack you might pick up
The Shapeshifter creature type on its type line is really more of a flavorful touch than anything else
However, it's difficult to completely rule out the possibility of Pocket being a pay-to-win title
Some of the monsters you'll be able to collect are Greninja, Lapras, Drifloon, Zorua, Ho-Oh, Xerneas, Kyogre, Lunala, Zekrom, Zacian, Slowpoke (in a well!), Unown, and Meowth, among others