Overrule?

It lacks the efficiency that many other counterspells have, as noted in my sixth point under "What this does not include". Thank you though!

Rebuff the Wicked

nevermind. read the description lol

Great list. Dawn Charm is a good one to add.

How bout Dash Hopes in black?

Also Rebuff the Wicked in white

pigskinlover, thank you for taking the time to suggest Dawn Charm! However, the fact that it can be played in nonblue decks is not enough to balance out the downside that it only can counter a very small category of spells. See the sixth point under "What this list doesn't include" in the description.

KayneMarco, thank you for taking the time to suggest Dash Hopes and Rebuff the Wicked! However, the fact that they can be played in nonblue decks is not enough to balance out the fact that Dash Hopes will rarely counter the spell it's targeting due to the alternate effect and that Rebuff the Wicked only can counter a very small category of spells. See the last point and the sixth point under "What this list doesn't include" in the description, respectively. That last point was newly added because it was something I forgot to include, so thank you for helping me refine the list's parameters :)

SaltySpecula, thank you for taking the time to suggest Perplex and Grip of Amnesia! However the fact that they both have a way to cause the counterspell to fail besides paying mana means that they are unable to counter spells that would result in winning the game except in very specific scenarios. See the last point under "What this list doesn't include" in the description. It was newly added because it was something I forgot to include, so thank you for helping me refine the list's parameters :)

Why isn't Counterbore in this list? Is it not in just because the list is only for commander?

Dellog, Yes, although 5 mana is probably too much for a counterspell in nearly all other formats as well, in spite of the fact that it has a super sweet extra ability.

Absorb? Commit / Memory?

Midwest, Absorb is probably not worth the three mana, but Commit / Memory's ability to counter uncounterable spells is sweet! Thanks for the suggestions!

Love the list! Though I'm curious as to why Supreme Will isn't on the list, as it seems to meet the qualifications. Sadly, Condescend and Syncopate don't seem to meet the 4th criteria, unless you think the option of scrying 2 and/or exiling the spell is worth it.

i know it's fairly narrow, but Warping Wail which can be in any decks that aren't strong in counterspells is pretty great. low cost, and can do other things too.

Mystic Snake

What about Ionize , Suffocating Blast , Frilled Mystic , Plasm Capture , Avoid Fate , Double Negative , Dovin's Veto , Dromar's Charm or Drown in the Loch ?

I was wondering why Silumgar's Scorn made the list, as I find it very very narrow.

Also I wanted to suggest Summary Dismissal, even tho it has 4 CMC.