[OP17-008] - Jozu (The World's Strongest Warriors)

If the base power of my Leader [Edward.Newgate] has been changed to 7000 by another effect that states “set its base power to 7000,” and I activate this [On Play] effect, what will my Leader's base power be?

In this case, its base power will be 8000 until the end of your opponent's next End Phase.