Being able to play whatever you want without worrying about the cost, or plumbing all that mana into an obscenely massive X-cost spell, can devastate the board
(See rule 614, "Replacement Effects," and rule 615, "Prevention Effects.") Abilities that trigger when damage is dealt trigger now and wait to be put on the stack
It means that more people will get into Disney Lorcana , more people will feel the joy of getting a gift, and more people will start going to the cinema, which is a plus in my eyes
Unfortunately, those tokens do get sacrificed at the next end step, but that only seems fair since otherwise, it would be a bit too powerful
But you cant just play your best cards on round one, because each card costs mana and gaining mana takes time
The activated ability is the real core