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The decks that play this colorless card are equipped to exploit it, and that turns this into a powerful win condition

(Source) As far as it goes for The Dark boosters, they contained only 8 cards, including 6 Commons and 2 Uncommons

By dead cards, I mean cards that have little to no use in a particular matchup, like a creature-kill card versus a creatureless deck

What I mean by that is, if I released a new pack of CFDF cards - don't think you've gotten away from that analogy just yet - and one particular character card dominated 80 or 90% of competitive decks, then power creep can be a good thing, diluting the potency of the offending card by way of newer, more powerful alternatives, or counters

Booster containing 1 random card among 4 different ones

Given the number of Treasure tokens taking over Commander, every time a player wants to spend mana, you can start pinging their life down with Mayhem Devil