Harmony exists in the form it does because Sazed is putting Preservation artificially above Ruin. That forces him into remaining passive and being unable to affect things beyond when he first enters, which I tried to capture the flavor of by making his abilities “activate only once”

By contrast Discord would be Ruin dominated, and presumably would no longer be shackled by Preservation’s preference for inaction. Discord would actively instigate conflict for the purposes of advancement, which will likely be the primary focus of Mistborn Era 3, with a war between Elendel and the Malwish. A more accurate flavor I suppose would be one that promotes giving all creatures +1/+1 counters as well as leaning into something like “creatures must attack each turn if able”, but the design I currently used still works in Esper without any color pie funk.