Under that payoff category, I would also put
hypersonic dragon. It is a pretty great card. You don't realize how powerful casting sorceries at instant speed is until you do it. It makes
Mystic Denial. Just kidding, it is technically an instant, despite the card saying sorcery, I
forget exactly why, I don't think that set had instants, but regardless,
Hypersonic Dragon is still amazing. Oh and probably
mystical tutor. I know there are probably a million and one cards that
could go in that category, but I feel like those two are top tier and on the same level as the ones you listed.
Also something that wasn't mentioned (or maybe it was, I
forget) is that Izzet (blue red) is decent with artifacts. They aren't so much good as a color combination, except cards like
Saheeli, the gifted, but both red and blue like artifacts You get to play cards like
madcap experiment alongside
arcum dagsson, who wouldn't want to do that?