What are the gargoyles for? Moderate amounts of damage? Seems odd to see them in a deck with absolutely no earth quanta to buff them up a bit and make them more durable. Why not a couple of dragons instead, a mono dark with pests/devourers certainly should have the dark quanta for it in my opinion.
....of course I'm kinda new so I may not know what the heck I'm talking about there. Dragons ARE a tad expensive to play.
SHAME, how I missed that you have six dragons I have no clue.
But uh, yeah the gargoyles, any particular purpose they serve? They seem a tad redundant with all the other creatures you already have in the deck. It lacks any earth quanta to fuel their one trick with the +20 health, and you already have quite a few other relatively low cost cards in the deck.