7 Ursula's Return We Don't Talk About Bucky, No, No, No Offers a separate game mode for cooperative play
That may sound slow, but assuming youve also got a few one mana creatures like Ruin Crab, which mills whenever you play a land, and maybe a couple of copies of Tashas Hideous Laughter, then you can easily take someone out by turn six or so with this strategy
How many Game Changers are there
Whenever you use one of the new bending mechanics like water, earth, fire, or air, you get to draw a card, which is one of the best things you can do in Commander
Players likely enjoy the artifact commander's open-endedness
It's around #14 or 15 on my list and not in the Top 10 proper, but the ability to force someone to discard, and destroy artifacts and critters with one number is a very precise scalpel that destroys what you need, but tends to leave your own stuff alone