gloomy vine
Big Doctor Who fan here with admittedly really little know-how or expertise regarding making adjustments to decks. I play a lot of Commander but alternate the same 3 decks over and over again (all three of which my boyfriend who is far more knowledgeable literally held my hand in building). Personally I feel as though this deck lacks targeted removal, and in playing it several times against a wide variety of decks I find that flyers are a big issue. I'm not actually looking to change much of the deck-- as a whole, I love what it does, and I'm one of those silly billies that enjoys thematics so the more I can keep to the time-travel, space-y themes, the better.
I don't really have specific wants or needs here, just looking for input on 1) which cards in this precon list are underperformers, and 2) potentially strict upgrades to make the deck a little more competitive. The only card that I'm FOR SURE thinking of dropping is the Martha card-- she's cool, I just don't think this deck generates enough Clue tokens to secure her spot. I'm certain there are other underperformers in here, I'm just not sure which ones. I think my love of the lore is blinding my ability to make good judgments here.
Link to precon decklist: https://www.mtggoldfish.com/deck/5925135#paper
naive canyon
sullen fern
: Add an amount of 
equal to the number of time counters on Rotating Fireplace.
, 
for each tapped land your opponents control.
somber latch
, Exile a nonland card from your hand: Put four time counters on the exiled card. If it doesn't have suspend, it gains suspend. (At the beginning of your upkeep, remove a time counter from that card. When the last is removed, cast it without paying its mana cost. If it's a creature, it has haste.)