Does the "discard a spell" sticker on my personal card add damage or replace the spell's effect?

Question

Accepted Answer

It adds: when the spell is cast, an ally of the caster may discard a spell from hand, and the cast spell then deals 2 more damage, dealt by the caster. One reply read it as replacing the effects, which was disputed.

Aeon's End: Legacy

Does the "discard a spell" sticker on my personal card add damage or replace the spell's effect?