You can't spare four aether in, say, a mono life deck. My point is, either you run mono aether, which is simply another strategy, and not an unbeatable one at that, or you add aether, and then you're losing efficiency.
You cannot target an immortal creature. You can use its ability, you can sweep it up into a chimera, you can passively affect it with nightfall and fire buckler, but you can't directly target it. I would assume that means some sort of code would have to be rewritten, which isn't something Zanz is likely to do.
"How long have you been playing?" the way you said it is an attack, something you do not want to do unless you are trying to get to people to lose respect for you.
Why kill swiftly when you can kill slowly? Time can't even kill at all, and there are already fire and air if you want to massacre stuff. Each element has its strengths and weaknesses, and shouldn't lose their "flavor" by all acquiring the same capabilities.