I think the matchup is a race because the matchup is a race. If you have ever seen a game between a burn deck and a monsters deck the match is 100% about dropping the monsters player to zero before they flood the board with so much power you don't stand a chance. G1 is not even close to un-loseable with YP as monsters runs a great many cards that cause the burn deck problems. Courser is a wall that gains life. Polukranos is a fatty that eats your blockers. Stormbreath Dragon is a fast clock we can't chain. Xenagos is a clock that grows at anNot sure how Harness is good.
I don't get why you think the monsters match up is a "race". That matchup is incredibly easy with the YP$ version, G1 is almost un-loseable (made up this word).
alarming rate that can also crap out fatties. Even caryatid is a bitch. Last time I checked YP doesn't magically beat all these cards, and it will still die to removal in many games.
Harness is a card that has been excellent for me, and I've explained why, so if you still don't understand I suggest you run the card.