The effect of “Elemental Hero Thunder Giant” targets a monster.
Discarding a card for this effect is a cost.
This effect can be chained to.
If the effect of “Elemental Hero Thunder Giant” is activated, targeting “King of the Skull Servants” with 2000 original ATK, and the opponent chains “Curse of Aging” and discards “Skull Servant” to activate it, then “King of the Skull Servants” has 3000 original ATK and is not destroyed.