i used them along with nearly all wastes until I got the thought-knot seers. Taken out because the deck was a little top heavy with those and the reality smasher both in the 5 drop slot. A acceptable but essentially vanilla 4 drop substitute I also tried was ugin's construct. No trample and doesn't become huge but still a respectable body.
given the cards you have, i am thinking you could go blue and white control with all the awaken cards you have(possibly with adding the colorless eldrazi cards as a "third" color. If on a budget, try trading your unneeded cards on pucatrade to get other cards to fill out the deck. for the colorless, if interested, I would get a few copies of shrine of the forsaken gods.
btw, the deck was so successful that I plan on not playing this deck again until gameday so people won't put in sideboard hate like aligned hedron network.
went 4-0 at FNM this week. round one was in 3 games versus jeskai prowess, round two in three games also against dragonless esper control, round three was two games against BW lifegain, and round four was in three games versus atarka red. I didn't sideboard for round 1 and 3, but did sideboard in rounds 2 and 4. Round two I brought in ugin and 4x oblivion sower and taking out the targeted removal(his creatures were hexproof) and in round four I sideboarded in the extra copies of titan's presence and spatial contortion. My list was based on chapin's list with less thought-knot seers(due to them not being delivered yet) so I substituted in ugin's construct.
i don't see the problem with adding managorger hydra if you don't mind the slight decrease in potency of shaman of the pack(since it isn't an elf). Usually go wide with elves and then to the face with foul-tongued shriek. mana gorger is more of a go tall strategy though.
btw, brother played his elves deck and got 3-1 with the sole loss being to esper dragons in three games. tainted remedy crushed versus abzan and aristocrats.
I see some synergy between nissa, vastwood seer and sylvan advocate with nissa helping to get to six lands while at seven lands you get nissa's 4/4 indestructible token. I think both would help strengthen your late game if necessary. Thinking nissa in the sideboard probably for those long matches.
I wouldn't bother with jungle hollow as it is too slow coming into play tapped. If playing a tapped dual land, the hissing quagmire would be stronger. Maybe a two of tops and use the space from dropping the other two lands for another shriek + coco. I agree that coco is better than sylvan messenger as they come into play instead of just into the hand.
My deck is based on the Chapin 100% colorless deck with changes due to not having 4x thought-knot seers. I substituted in walker of the wastes and made half the lands wastes. My brother piloted the deck last FNM and went 3-1 with the sole loss being from abzan. Abzan charm is a beast against this deck.
this is my list that I've been working on for a couple days. It has the combo included in its white weenie shell so there will be plenty of creatures on the board to take full advantage of the gideon emblems.
spells and creatures:35
4x endless one
4x hangarback walker
4x ghostfire blade
4x eldrazi mimic
2x spatial contortion
2x warping wail
4x matter reshaper
3x titan's presence
4x thought-knot seer
4x reality smasher
lands: 25
4x foundry of the consuls
2x mirrorpool
3x rogue's passage
4x ruins of oran-rief
4x sea gate wreckage
4x shrine of the forsaken gods
4x tomb of the spirit dragon
SB:15
2x ulamog, the ceaseless hunger
1x ugin, the spirit dragon
2x sactum of ugin
2x haven of the spirit dragon
4x oblivion sower
1x kozilek, the great distortion
2x spatial contortion
1x titan's presence
btw, brother played his elves deck and got 3-1 with the sole loss being to esper dragons in three games. tainted remedy crushed versus abzan and aristocrats.
I wouldn't bother with jungle hollow as it is too slow coming into play tapped. If playing a tapped dual land, the hissing quagmire would be stronger. Maybe a two of tops and use the space from dropping the other two lands for another shriek + coco. I agree that coco is better than sylvan messenger as they come into play instead of just into the hand.
land: 21
4x battlefield forge
4x caves of koilos
13x plains
1 drops: 7
4x dragon hunter
3x kytheon, hero of akros
2 drops: 15
3x anafenza, kin-tree spirit
4x knight of the white orchid
4x pacifism
4x valorous stance
3 drops: 10
2x call the gatewatch
4x eldrazi displacer
4x oath of gideon
4 drops: 7
3x archangel of tithes
4x gideon, ally of zendikar