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Mermaid's Playfullness seems really busted for an effect that is really easy to trigger (I like the concept as it shutdowns Decks hard, but the mass negation seems a bit iffy I dont know) Serena should say draw '1' card, not 'a' card

If you want to address these issues and make Silverquill Influence the best Commander deck it can be, then the following upgrades are a great place to start

@mcdoo that is the way I was thinking about doing it

For two mana, Drannith Magistrate can halt entire strategies and force the table to play a much slower game

They often wind up with the players in that color pair, but they're also playable with just the card's main color

I've run numerous black or effectively mono-black decks in Commander for years