Let's take a look at the Arena deck idea.
Before we can analyze this further, we'll need to know a bit more about your account. Do you have enough skill points to afford double/triple mark, double draw, extra HP and all those fancy things? Do you have upgraded cards to work with?
For now, I'll assume that you have enough for some basic things like a double mark and a good chunk of extra HP, but no upgrades to use.
Since you generally won't be igniting those Gases too early, we'll switch to an Air mark with Fire Pendulums and Aether Pillars instead. This will ensure that your
quanta comes in at a fast enough rate -- more on this later. As for the rest of your card choices, they're pretty solid overall. However, Lobotomizer doesn't really fit in too well with how the deck operates and also interferes with the AI logic a bit. I've also added some Shockwaves for early survival purposes, since getting outrushed hurts, even when you have a good amount of bonus HP padding.
As for the AI logic, it will always Ignite its Unstable Gases when it can. It will play Dimensional Shields when it needs to -- usually when it's down to around 75% HP or so, and will likely automatically play Quintessence on the Blue Nymphs on the turn they come out (provided there is enough quanta to play both at the same time). We need to get more
quanta flowing, since the AI will only activate abilities when it feels it has "sufficient quanta" (usually around 2.5 times the amount of quanta needed to activate). Otherwise, your Nymphs will never start generating Gases.
Sample Build (assuming 2x mark, and as much HP as you can throw your skill points into):
5gi 5gi 5gi 5gi 5gi 5on 5on 5on 5p0 5p0 5p0 5p0 5p0 61o 61o 61o 61o 61t 61t 61t 61t 61t 61t 621 621 621 621 63a 63a 63a 63a 63a 63a 63a 63a