It isn't super pressing but you might just not find the right answer and have to use something awkward
Beating the control and combo decks is generally just a case of throwing in countermagic, and not even that much
As always, I lean on Duress and Arguels Blood Fast against control
Multicolor Cards Credit: Wizards of the Coast Errant and Giada FromTheShire: Having a cheap Commander you can get down early is always nice, and flash is sweet as well
The life gain played by normal decks to sure up their matches against agro decks has to minimally impact the deck in their other match ups however in decks that are really abusing life as a resource such as Necropotence you typically need some life gain just to enable the continued use of your effects
Each deck has at least $60 worth of singles, some staples with retained utility, some neat reprints and original printings of classic EDH bombs, and 15 of early Commanders most popular legendary creatures