Any idea what he could have played to 1 shot me?
Sounds like you decked out maybe? How many cards did you have left?
Anyways, Neptune isn't hard as long as you have quint. He plays a lot of creature control early on, but his only permanent control is the trident, and he doesn't seem to have
quanta.
He also seems to be low on pillars, I was actually able to wipe out all of his pillars using pulvy. Maybe he just had a bad draw against me though.