If you're fighting ordinary mobs, you have way too many cards, and you should cut it back to X3 Gargantuan, X1 Deathblade, and X3 Scarecrow. There's no point in anything else unless you happen to learn Deer Knight. If you believe you need other cards, carry them in your side deck as TC.
If you're fighting a boss solo, this setup looks good.
If you're fighting a boss with a team, you might just take out all your hits and focus on putting blades and traps up, as well as putting plagues on the enemies.
Altho it does depend on your game play style our Death runs a much shorter deck situation.
1 stun block for fights that can stun 3 gargs 3 death blades 2 death traps - and one from gear stackable 2 feints 2 scarecrows 2 wraith 1 vampire if finish up is needed or tcs as back up 1 tri blade 1 tri trap - rarely used wand of course if running in group a sacrifice is put in
Extra blade from Wintertusk crafted helmet. Scarecrow pet with MC, death blade, trap, spritely
Mob deck set up of course is a lot less based around Scarecrow and can be the starter deck We usually keep 3 decks one mob, one boss and one to customize for solo events like for spells etc. or cheating bosses.
Your style and mind are different, and you dont have Sharpened blade yet (and wont for quite some time) but what I did was go for faster attacking. I used spells that buffed at 0 pips (Death blade, Curse, death trap). Also, all of my spells were life sap spells so every hit healed me. Go with less cards and add in a reshuffle or two and you'll be fine
Looks pretty good for a boss fight, just that you shouldn't need to train Life as a Necromancer in my opinion, you have your drains. For mob fights, you should have a few Scarecrows, the same amount of Gargs, and some blades.