Mudgill is actually quite flexible with a ton of items:
OFFENSIVE:
Bonebiter. (Shit ton of boss dmg with chunk, def shred/penetration & max hp% dmg)
Unerring Arrow. (Oneshot EVERYTHING in infinite with 6 fully tempered arrows)
HARVESTER (Ye olde brokeen combo)
Tenacious Synergy (Str scaling from thrash)
Pretty much any “on attack” item ever created (self explanatory lmao)
SUPPORTIVE:
Banner of Energy. (Nonstop attacks that mana battery everyone adjacent)
Plague Blade (Supports debuffers like Nessa Wyrmlet & Pyris)
Etc etc…