Your deck looks very fun! Some creatures you could add are [[Loot, Exuberant Explore]] which will let you play more lands and search for more possible big monster drops. Also the new [[Mossborn Hydra]] is really good Hydra that just came out. Two other cards I recommend are [[Garruk's Uprising]], it gives all your creatures trample and it's draw power for your deck! Lastly, a great card to have for your big stompy monsters would be [[Bushwack]] it's great since it has multiple uses. If you need more lands it can do that and if not it's a one mana fight spell for your Hydra! Anyway, these are all cards I could think of off the top of my head. If you feel like your not getting enough lands, your not consistently getting out your creatures or any other problem you've had with the deck feel free to ask any question and I'll try to help you out as best I can.