Jagged Edge (Red)

When Jagged Edge resolves, the targeted weapon attack gets +3 and a static ability that makes the damage dealt from the attack be unpreventable. If you targeted a dagger attack then were to “flick” the attack’s dagger, the damage the dagger will deal from that effect would be preventable as the static ability’s effect only applies to the dagger’s attack but does not apply to the dagger itself.

Only the targeted weapon attack is what gains the static ability and the power increase, not the weapon itself. If you attack again after the attack where Jagged Edge’s effects were applied, it will not retain those effects for those subsequent attacks.