[Primer] Six Shades of Dressnought aka Vaka-Nought

[FTW]

Surgery = Invasive Surgery. Not Surgical.

Yes, Invasive Surgery does not work in a deck that cannibalizes its own graveyard (2 Murktide + 2 Kroxa) and lacks DRC self-mill (0 DRC). The Dressnought player wouldn't have Delirium.

With Sailors' Bane instead, the deck would have an easier time supporting Delirium for Invasive Surgery. Sailor's Bane would make the Plow/Ending matchup much better. Instead of trying to strip their removal (via Surgery or exile-mill), play a threat they can't remove. TNN works too, but Bane counts to 20 much faster. That build would need 4 DRC to fuel Sailor's Bane, and then has an added benefit of supporting some SB Surgery if you want it. It could also cut Kroxa and black for cleaner mana. But it would lose harder to Chalice @ 1.