Cards instead of spheres

I haven't seen this idea touched on before. Why not replace the pal spheres with "pal cards"? Instead of throwing a ball or a sphere, your character throws a card that summons the pal. Same thing for catching. I haven't seen a concept in any other game that involves THROWING a card to summon a monster. I think this would not only be a good idea for the game but a good idea in the long run. There were rumors of Palworld wanting to venture into the trading card business. If cards were a key aspect of the game, that would make their trading cards much more desirable.