Hi,
As far as I know, the only heroes who can consistently destroy ongoing cards are The Argent Adept (via Sarabande of Destruction and Cedistic Dissonance), Bunker: Engine of War (via Locomotion), The Idealist (via Giant Floaty Head), and The Visionary (via Mental Divergence). By "consistently," I mean "not via a one-shot card," and I think (barring incapacited abilities, because one should never want to use those) powers are the only way to accomplish that. So, I was just wondering if anyone can think of any other such heroes for use against ongoing-heavy villains (e.g. Iron Legacy, Plague Rat), or are those four the only ones?