The cards back then meant that you needed to evolve them up to their higher forms for them to be helpful or useful, but they were not always necessary to start with
Commander Legends had a gimmick where in one slot, your Collector Boosters had only a 30% chance to contain a Foil Extended Art card
Finally, the card also has a third useful effect, as players can draw a card if a card leaves their Pendulum Zone, which punishes the opponent for disrupting the board
episode 114: "Brothers in Arms, Part 1"
Depending on your future needs, you may end up with decks that have greater or fewer of each main category, though you'll rarely, if ever, climb higher than 20 Pokemon or 15 Energy
It is not the most reliable of pure life gain effects as all kinds of removal can really set you back in tempo and will therefore almost certainly finish you off given that you were trying to gain more life