You've basically described a power that instantly undoes the effects of whatever power has just affected you: if you're hurt, it heals all the damage; it you're healed, it hurts you back to where you had been.
That's all a Special Effect. The power is your powers don't affect me.
But Desolidification, 0 END , Persistant, Always On, Fully Invisible, Cannot Pass Through Solid Objects. Then purchase Affects Material World for your STR and any other powers/attacks.
When you're hit by an effect, you ignore it (unless it's Affects Desolidified), and you tell everyone "my power just instantly countered that effect".