My new deck and Comments?

3 Raiza
3 Caius
3 LADD
2 Swap Frog
2 Treeborn
1 Gorz
2 Fishborg
3 Tengu
3 Fader
2 Veiler
2 Mobius

3 Soul
3 Controller
1 One For One
1 Foolish Burial
2 MST
2 Avarice
1 Hole
1 Reborn

add one more swap frog and remove one raiza
and make space for a dark hole and trunade

other than that pretty good deck

You could try as well Treacherous Trap Hole or Genex Undine with Monarch and Frog

Tengu is cool but a little uneeded here IMO. Same with Veiler.
-2 Veiler
-1 ladd (he's sometimes dead at 3)
+1 swap (you NEED ti get Treeby in grave at least by turn 3 or you're pretty much done)
+1 dark dust spirit/vanity's fiend
+1 trunade (duh)

personally, I use both the Genex Engine and Swaps. I run 2 Swap, 2 Undine, 2 Controller. Gives some variety, a better chance to dump Treeby, more synchro power with 2 more tuners, and an excuse to run Allure

i think you should keep the veilers. monarchs don't have that much backrow support so they need the veilers to help keep some kind of control on your opponent's monsters.
and why not add Ronin Toadin? extra tribute fodder in case they somehow get rid of your treeborn.