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The short answer is, use what you want

When your opponent declares a direct attack, you can simply discard this card from your hand, negate the attack, and end the battle phase entirely

Doorkeeper Thrull prevents the enter the battlefield trigger of all artifacts and creatures from happening, making it a particularly good way to shut down many strategies in Magic

Theres definitely a deck where using Cogsworth Illuminary Watchman to make her challenge whatever is a good idea

You Dont Want The Strongest Decks In MTG: Commander Look For Decks That Are Genuinely Fun To Play While winning can be fun, using the strongest decks out there is not always entertaining

If a card your opponent owns and possesses is banished face-down while you control this card (except during the Damage Step): You can banish cards from the top of your opponent's Deck, face-down, equal to their face-down banished cards