New Doran's Item

Ever since they changed the price of null magic mantle, that kind of puts some laners at a disadvantage. Some people facing an ap top would usually buy null+2 health pots, but now you cant start null and i think that gives ap tops such as mord or teemo an advantage. maybe they should add in a new dorans item that could give you magic resist. Maybe something called Doran's Cloak or Doran's Spellshield that gives you, say, 10-15 magic resist with a passive that reduces single target spells damage by 5 or 10 damage. Although this might be a bit much, but maybe t gives 50 hp too. That might be a good item to add in.