I've got a Dragon/Devour deck based on Prossh for contrast have a look here:
http://deck.tk/3AEJ0OsgFlaws I am aware of in mine:
Slower mana ramp currently, although card draw can become an issue in later game.
No tutoring (it's not allowed in our house rules)
Missing/Weak removal (can't cope with enchantments for instance)
But it's a strong deck once it kicks off, often fielding 15-20 tokens at a time ready for Prossh to consume. It does require a bit of luck but is mighty fun to send the hordes of dragons into battle.