new to tournaments, deck advice please :)

Because of the prevalence of putrefy/mortefy (such as you are running)
I like to have a creature with some sort of way to evade that, or at
least take advantage of it. In B/W that creature is Ghost Counceil of
Orzhova. He also provides an outlet for you to sacrifice your
dragons, which is never a bad thing.

Also, because of Faith's Fetters and game winning enchantments such as
Debtors' Knell and Glare of Subdual, I like to run two naturalize
(better yet, Seed Spark) in the main board.
You definitely want these guys in the side. Maybe even creeping mold,
as an opposing Moaning well can sometimes be really bad for you.
Playing W/G/B, you could also think about running a copy of either or
both of Vitu-Ghazi or Svogthos, as you will likely have a number of
creatures in the grave.

Tops seem sub-par in this deck, as you have only 4 shuffle effects.
That is where they really shine.

Seems pretty solid, I think play-testing will help you out with what
works and what does not. Also, playing a couple times will clue you
in on to your local metagame, and that will help w/ the sideboard
choices.
 >> Stay informed about: new to tournaments, deck advice please :)