To tune this deck up, you would want to add in more tutors
Generally you want to use regular Absol or Zoroa as your opening active card, while keeping Bombirdier and Nihilego on the bench where they're most effective
Unfortunately, it's hard to find an NM copy, leaving plenty of room on the upside for the market price to increase once one is sold on TCGplayer.
Side Note: the reason why I chose to only run 2 Swallow's Slashes instead of 3 was because a) I'd found that 45 was a good deck size, with an 85% chance of opening with a play that would lead into the minimum of Fraulein or Samuraisaga, so to add a third copy would mean either dropping Trinities or bumping up to 50 b) Swallow's Slash requires a Shiranui monster in your deck to be banished, so while running multiple copies would be good, they would typically lose their usefulness as the duel would go on due to not always having Shiranuis in the deck to be able to resolve it
BUG Midrange, as its name suggests, is a midrange deck that revolves around the power of Deathrite Shaman, and a mix of powerful threats and permission
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