The introduction of the Cohort mechanic in Oath of the Gatewatch to allies several years later didnt do much to improve my opinion
For one blue, one green, and three colorless mana, you get a 6/6 reach, trample, and indestructible creature that can't attack or block if it doesn't have an even amount of counters
It may look cuddly, but this rabbits hiding a suite of infinite combos up their sleeves, in their hat, and pretty much everywhere
Plenty of players still run a colorless commander like Karn, Silver Golem or Traxos, Scourge of Kroog, but having mana sources matters even more with artifacts-matter partner commanders in all colors like my favorite, Keskit, the Flesh Sculptor, and commanders in three or more colors like Sharuum the Hegemon
Nighthowler Nighthowler bestows +1/+1 for each creature card among all graveyards