Karnak
How can you say Doom? He can Nullify tons on his SP1 he can also Buff Steal power steal, his SP1 is Lethal in some situations and very very good in alot of other situations where you dont want the defender to reach a SP2. I use Dr Doom V Dr Doom its a fun fight!
Technically would be Vision OG if you hit an opponent with no power. The attack itself does no damage, all damage comes from power burn inflicted by the drain.