In Toph, the First Metalbender decks, for instance, this can turn Bumi, Unleashed into an artifact, thus allowing it to attack infinite times over infinite combat phases
These visual 'stats' significantly impact their collectibility and price
To add to this, 4 copies of Kronch wrangler are early game threats which grow stronger with each large creature you cast, and the deck additionally adds copies of Garenbrig Paladin, Challenger Troll, and Beanstalk Giant for extra firepower
Alakazam has always been a chase card in the Pokmon TCG, and Pokmon 151 is no exception
Unless I am missing something, this effect is a little lame unless you have some effect that benefits from it, and I have not come across it yet in these cards (something like 'whenever an opponent draws a card, they lose 1 life')