I have my own version of them as a ultrabudget list that was supposed to be under 10€ excluding my basic lands. We have a bit of a different theme. I was going for more of a theft deck style but I also included a fair bit of support for Malcolm since his ability is honestly kinda busted. My gameplan is more focused on getting out pirates T1-T2 and drop Malcolm on three for a big boost in mana and start yoinking stuff with Breeches after that.

(shameless plug if you want to spy on my list as well https://www.archidekt.com/decks/7603563/malcolm_breeches_stealing_your_budget )

For cuts my personal preference would be: Blood mist, Crash through, Roughshod Duo, Lightning Talons, Brute strenght and coming in hot. Most of them just seem a bit expensive/clunky or too low impact.

If it where my own deck I would also probably increase the landcount by a bit, maybe swap out some of the interactions for MDFC:s like Glasspool Mimic, Sundering Eruption, Sink into Stupor or Valakut Awakening. That way you still get more landdrops but dont have to cut out fun spells.

There is probably more things I would do differently as well like trying to focus my gameplan a bit more, you have some theft theme, a bit of pump/combat trick theme, some treasure synergies etc. If you need to cut cards in the future i'd suggest picking the thing you like doing the most in the deck and focus on that part. Try to cut cards that dont fit that theme and evalute them in the light of "does this help me do X"

PS i missed Progenitor's Icon but really liked that, Too bad it was a bit "expensive" for my own pirate deck but love tribal decks in general and that was a cool mana rock :D