You're welcome! I know Season 4 gave Discord a pony form, technically, while it makes a good disguise, that, is what he should look like as a pony, though maybe if the whites of his eyes were yellow and the black part (pupil or iris I think) were a bit smaller, I think it would work better, but that's just my opinion.
Let's face it, he could get a lot more chaos done in an alicorn disguise than in his too-garish-and-recognizable regular form. Also, we've never seen a canon male alicorn (Shining Armor and maybe Blueblood seem to be some combination of unicorn magic and earth pony strength).
I love mythology! Plus it makes sense. the legend was that Eris, the goddess of chaos and discord used the golden apple to put tension and jealousy among her sisters. And what does Discord do? the same thing, only to the mane six! XD