That's a very good advantage, and the fact that it's so cheap to play means you can do a massive amount of setup early in the game, or just a play a big monster and have it get over its summoning sickness before the opponent can do anything whatsoever
The original Counterspell itself is a wildly efficient spell by conventional standards, but like almost any other counterspell that you have to pay mana for, it has downsides
Mono-colored decks are inherently weaker in Commander, and the precon faults of incoherent themes and bad curves don't help, but at least we can learn from their failures
We most recently went over Rankle, Master of Pranks (as a psuedo-Nekusar, the Mindrazer build but in monoblack)
Next week, Im looking to revisit a deck that has been collecting dust on the shelf for far too long, Gerrard, Weatherlight Hero