Hello! I’m far from an EDH expert, but I saw your post looking for some help with your deck and decided to come trolling. When looking back to edit my comments, I noticed that it looks like I’m just bashing your deck, but I merely intend to help you and your deck-nothing is meant in malice.
First off,
Murkfiend Liege is not allowed in this deck. Your commander’s color identity is only green, so you can only have green and colorless mana symbols. Dual symbols count as both, so you can’t have the ‘blue' mana symbol. (If you want to untap,
Seedborn Muse is a mono-green substitute)
Your converted mana cost is a little high for my taste, especially when you consider that some of your lower mana costs are actually high mana cost cards in disguise (
Mistcutter Hydra,
Windstorm,
Chord of Calling,
Hooded Hydra...) I usually try to keep my average mana costs under 3.5, which I understand can be difficult (especially with all those tempting big green creatures!), but it’s definitely worth the work. What made it click for me to lower my mana curves was a comment from affykay on TappedOut.net, who said something to the effect of "remember that your average mana cost is the average turn you can start putting things onto the battlefield". While it’s safe to bet on a late game in a 4 player format, you don’t want to be a sitting duck for four turns.
I would definitely cut
market festival. You only have one color in the deck, so it’s not a big deal to get two mana of any color-and for 4 mana it’s far better to get an
Explosive Vegetation (which you probably already have in your collection, it was an uncommon in Dragons of Tarkir).
Explosive vegetation will give you the same mana access (2 extra), gives landfall triggers, and thins out your deck so you get to draw some of those big hydras you want to cast. I realize there aren't any landfall triggers in your deck(that I saw), but they’re really powerful in green EDH if you decide to put them in.
Avenger of Zendikar is an absolute staple that goes well in (I would argue) any green EDH deck. I’m not saying you have to add a bunch of high mana cost cards, as I mentioned earlier that you should try to lower the average CMC, but you should definitely look into him.
Sol Ring and
Gyre Sage are great cards, but it’s not enough to ramp into a
Terastodon and a field of hydras. Many EDH players will tell you the player with the most mana early *usually* wins. Personally I’d add more cards like
Kodama’s Reach and
Cultivate. Mana rocks are nice, but you’re playing green-there’s a lot more fun/efficient ways you can get extra mana! Try
Oracle of Mul Daya or
Exploration. Playing extra lands not only give you the extra reusable source of mana, but since you’re running a lot of basic lands they won’t (usually) be targeted by your opponents, and the lands won't be destroyed by the overlorded
Vandalblast or
Bane of Progress. And again, cards like
Oracle of Mul Daya thin out your deck a bit and give you some control over what your draws are.
Ordeal of Nylea is a good idea, however the creature has to be out and attacking for 3 turns (without dying) to get you to those lands.
Nature’s Lore gets you mana much faster, is less conditional, and I think is a better fit even if it’s only one
forest. Notice that the text for
Nature’s Lore lets the land come in untapped!
If it seems like I’m bashing mana in the face here, it’s because I am. I usually play green in my EDH decks too, and I do acknowledge that I’m a bit of a mana nazi. (Which reminds me, your mana curve should look more like a bell curve. What happened to turn three on that chart?!)
Anyway, on to other things, I do like that you have card draw in here, but I don’t like
Masked Admirers at all. Sure you can get it back from the graveyard, but there are better/more consistent card draw outlets-Primordial Sage and
Soul of the Harvest come to mind, though I would most like to see Drum Hunter replace
Masked Admirers. It gives you some colorless mana, has a lower CMC than the other two card draw suggestions, and from the looks of your deck will in most cases still let you draw a card at your end step. It still dies to a single
lightning bolt/strike, but so does
Masked Admirers. Everything dies to the right removal after all.
I’m not sure where the value is in
Tel-Jilad Fallen. Infect is nice, but most decks you are going against will have non-artifact creatures, and with 1 toughness he will die instantly to practically any blocker/attacker, so all I’m seeing a 3/1 for four mana that *might* put a dent into a problem creature. However I might just be failing to see the value there, I’ve never done much with infect in my playgroup.
As I said before, I’m far from an expert at magic and/or edh, so feel free to
dismiss this as an internet idiot throwing in their loudmouth opinion. Good luck with your deck, and most importantly, have fun! Welcome to EDH ^_^