Perhaps disable Triumph and Dark Harvest from aram? This will stop the current aram player's dilemma

Team A is going to play vs team B. Each team wants to maximize their fun. Let's say fun has a score between 0 to 3. If team A picks Dark Harvest and team B doesn't, then team A scores 3 points, while team B scores 0 points, since team A will dominate over team B. And if it's the other way around, then vice versa, obviously. If Both team picks Triumph + Dark Harvest, then each team will score 1 point. You got an equal chance of winning, but it's still going to be a snowbally shitshow, and game will be decided by the first team to get a slight lead. If neither team takes Triumph + Dark Harvest, then the game will be an exiting non-stop fighting brawl, without a slight kill lead snowballing games out of control. Each team scores 2 points.

Everyone agreeing not to take Dark Harvest + Triumph would be the best solution here, but that's not realy possible. Disabling Triumph and Dark Harvest would make each team score 2 points every time.