A mana ability produces mana as part of its effect
Brawl Legal Vintage Legal Timeless Legal Commander Legal Pauper Not Legal Oathbreaker Legal Penny Not Legal Toolbox Buy This Card Notes and Rules Information for Lightning, Army of One: The damage is dealt by the same source as the original source of damage
A beast of a card, Chernabog, Evildoer gets cheaper for each character card in your discard pile, so it's easy to start pondering up ways to get him out nice and early and start punishing your opponent
With time and focus, eventually, you'll be able to recognize each card for its abilities in any given scenario

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Considering that 5-color decks can lack focus and trade synergy for flexibility, I personally dont think 5-color commanders are a problem