Don't use Plasma unless you have enough cards to use Trade-In. He's out of place here so you can ditch both him and Scapegoat. You also only have 13 spells, and only 9 Normal spells, so Dude is also a bad choice imo. You need at least 14-16 Normal spells to make him mathematically worth using. Better to just replace him with The Wall - Defender. You'll be wanting to use Arma Knight here too. He can dump PSZ and Malicious without any fuss or loss of card advantage, and an opening play of Arma Knight --> Necro Gardna has become a standard good move nowadays. RftDD isn't probably 100% needed, since you have Burial which works just fine and doesn't cost all the LP. In your side deck, you'll never use Pulling the Rug (or hardly ever), so I suggest replacing it with something useful like a 2nd Caius, maybe a Mirror of Oaths, Mind Crush, or Waboku. In the Extra deck, kick out Airbellum for Ha Des. He has a pretty wicked effect when used correctly. You also don't need Armor Master since you aren't running Gale, so replace him with maybe something like Magical Android, Armory Arm, or Psychic Lifetrancer. So, my main deck suggestions are:
-1 Plasma
-2 Dude
-1 Scapegoat
-1 PWWB
+2/3 Defender
+2 Arma Knight
+1 Book of Moon (if 2 Defender)