just on your team. Also , as i said , if u intend on going purely for 15 stars , u don't need even 1 heavy. So leveling 2 is pointless. If u want to level your team enough to do this whole event , u will still need to power grind , but honestly , i doubt it's worth wasting so many scs just for a pirate event. In the end it's all up to you and on how much u are willing to spend