Different World Card Deleter

Lin Ci traveled into the world view of his card-gaining mobile game and found that there was a new button next to the surrender button. [WARNING] [A fatal blow is the ultimate means to completely defeat the enemy in front of you, using the soul of a hero as the ultimate power. After using this skill, enemies within the range will be killed instantly, but the lost hero will not appear in subsequent plots or any restarted weeks, and will completely disappear from the game, along with the personal plot that appeared, into nothingness. ] [Even so, do I still need to use it?] [Yes/no] AOE is death? Delete the card pool? I know the benefits, but what's the cost? Changes in the world line brought about by the disappearance of the character's personal plot: Hehe, I will definitely bring you endless surprises!