Let me imput some opinion here: Ban QTs, and not SNs.
As said many times already, although efficient, 12 of Steals, Explosions, SoGs, and whatnot is just incriminating to the spirit of the Arena and to players.
If QTs are banned, SoGs will not be much of a problem because you will need to run an SN based deck to fuel spam them efficiently.
Here's why SN is not a problem: if QTs are based, decks that want to splash in a few elements (such as Entrodulum-oraclecard decks), still somewhat bases their strategies over the oracle card. Also, SN is VERY important to creative deck building. For example, I just got Wyrm as my card today. I decided to run off 1X Entropy Mark, Chaos Powers, and of course some Wind Pillars, but I thought that is just boring. As a result, I switched it to 2X mark, tossed in SNs, Wings, some CC and PC, AND the vital cards: The Death and Aether spider which helps me web down flying creatures. You see, without SNs, I only have myself a boring, uninteresting deck. But with it, it is possible to further utilize effective synergies of an element and make creative decks.
The poll does not have an option to ban just one of those. Please change it QT.