Ideally, you drop this once you have a few creatures already ready to attack
2 Magic Online: It's A Card Game Simulator At the end of the day, Magic Online isnt so much a game as it is just a way to play Magic: The Gathering
I will only actively want to play this if I am fairly heavily blue and have a much higher curve than I typically like
No Mercy is a great symmetry breaker, especially in decks that want creatures to attack each other player or decks with the monarch mechanic
While that may seem like a lot and realistically, it is given the scope of what you can do in Commander, and the different approaches you can take when brewing (budget, win condition, theme, kindred, etc), it can come together quite easily and offer a varied set of decks to pilot