Turn over turn, Weeping Angel will suffer from the drawback of the opponent being able to turn it off as a blocker by casting creature spells, but this wont always be an option, and through discard or counterspells, there are tools for Dimir decks to save Weeping Angel from opposing removal, all while being able to attack the opponent or their planeswalkers with a vigilant creature that is quite unpleasant to block
Martha Jones I love pairing card draw with pressure, so Id be happy to slip Martha Jones into any Clue deck
Sinew Sliver
1-9 | Return a card at random from your graveyard to your hand.10-19 | Draw two cards.20 | Put a creature card from any graveyard onto the battlefield under your control
decks revolve around putting extra lands into play, and making your land drop every turn is one of the best game actions you can take in Magic, especially in Commander
It also fights against the politics of EDH by giving every player a definite enemy for them to focus on