The cards that Ive been most disappointed with are the counterspells, like Clash of Wills and Calculated Dismissal
You often need to spend a lot to update your deck when a new reprint comes along
I've also focused on cheap protection for Cloud like Loran's Escape, and something that nobody really talks about is Green's "draw cards equal to power" which is bananas here like Hunter's Insight which is easily a 3 mana draw 7+, I find it kinda silly that all the precon guides are focusing on more expensive and less efficient draw options like Sram, Senior Edificer or even Sword of Fire and Ice when you can just out-value all of that with cards that are less than a dollar
However, it does give players a good chance to experiment with styles of decks and commanders that they may not have used before
Note that it will survive the sweeping removal in this brew, as well as attacking with any 4-powered dork, like a Durnan with a +1/+1 counter on it
The original Ravnica: City of Guilds radically improved upon this strength by defining philosophical and mechanical overlaps between each combination of two colors