Adding more charge counters won't give it additional abilities, but other effects or cards might make those extra counters relevant
Phenax, God of Deception, Lazav, Dimir Mastermind, and Mirko Vosk, Mind Drinker are the three main generals, but Dimir has many options when building mill decks
Disney Lorcana is one of the best card games available right now and one of my favorites to play with a group of friends when youre feeling a little tired of gaming
Tarkir: Dragonstorm [Best Dragon Tribal + Wedge Draft] Tarkir: Dragonstorm is the return many of us were waiting for
Nice synergy with Boo and others, and then you can -2 them to sacrifice a dork you control and shoot a target where that was its power, another cool way to play into Boo who just got built up last turn and you'll make another for free, so that's fun synergetic card that...can be your Commander
That's what this list will help you answer, exploring which are the strongest, but also most useful for you to use against your opponents, whoever they may be