Win a game without ANYTHING that cancels something or discards conditions.

Check. Yes, I've played a game without A Test of Will, Eleanor, The Door is Closed!, Hasty Stroke, etc in my deck. And won! But probably not against a scenario with killer treacheries... so, not recently.

When deck-testing, I've played plenty of 2-handed solo games without any cancellation effects whatsoever. Sometimes you just get lucky and don't have to deal with the worst that the encounter deck has to offer; other times, you take all the treacheries to the face. I actually especially relish winning scenarios when I haven't cancelled a single thing. (Also, I only ever slot in condition removal when I feel like I NEED to.)

I actually don't usually use the cancellation cards nowadays. In the early days of the game there were a few really nasty cancel-or-die treacheries, but other than that we have a wide enough cardpool now that I consider cancellation just one of many options for dealing with the encounter deck.

Pretty common thing to do, actually. Especially in solo.

I just defeated Voyage Across Belegaer with my mono-Leadership Gondor deck, so there you have it.

i never play test of will. and i always win games ☺

If you play mono-tactics or mono-leadership, you can have your arse served on a plate by treachery cards.

Actually played a Caldara deck that had no cancellation. Did pretty well vs Foundations of Stone.