No, I don't think so. It's somewhat inconsistent and likely has a lot of matchups that swing hard one way or another. When it's working, it is an awesome deck and, with judicious mulligans, capable of t4-5 kill unhindered. But, that's not fast enough to be pure aggro and, at the least the BBE version, doesn't have enough late game.
I've played 2 online leagues with it so far and first went 3-2:
2-0 vs Storm, 2-0 vs. Jund, 2-0 vs. Serum Powder Eldrazi, 0-2 vs. GW Elves (a nightmare matchup) and 0-2 vs. 5C Humans.
And then managed to 5-0 on my second attempt:
2-1 vs. Mono-G Tron, 2-1 vs. Mono-G Tron, 2-0 vs. Mono-U Tron, 2-1 vs. RB Hollow One and 2-0 vs. Blue Moon.
Thalia has been great for me so far and I consider adding a 4th copy to the SB.
The sideboard can probably be improved, the PW's were intended for the grindy midrange match-ups with lots of creature removal but they maybe unnecessary and the slots might be better used for removal (or even sweepers). Fragmentize has been pretty good but might be better as Natural State for instant speed
(though it might be better in some corner cases against 4-cmc cards).
What about Ajani, Mentor of Heroes ?
It doesn't exactly affect the board (if you don't have a creature to pump) but seems to fit the deck better than Tamiyo.
My preferred PW for the deck would probably be Nissa, Vital Force though as all three abilities can be useful and she's has a high enough loyalty.
It has some potential but not getting color screwed seems very challenging. Ancient Stirrings also gets worse with the addition of so many colored spells (maybe Oath of Nissa becomes better for this list ?)
It's interesting that Phyrexian Metamorph was quickly dismissed while Phantasmal Image is being considered more seriously.
I find the upside of costing 1-mana (and 2-life) less not worth the Illusion-drawback.
Talking about some odd ideas, what about using Evolutionary Leap in this deck ?
It can help not run out of creatures and works well with the Scions and Matter Reshaper.
What do you think about Deadeye Harpooner as a removal (Swift Reckoning) on a stick option for this deck ?
It works nicely with E.Displacer and "Revolt" can be triggered by scions.
I like the maindeck Thalia but don't think that dropping the Path is correct, the SB is rather weak (and lazy) imho.
I've personally dropped blue altogether as I don't find it particularly good right now and went straight GW which makes the mana slightly better and lets me play more utility lands like: Gavony Township, Field of Ruin, Sea Gate Wreckage, Hashep Oasis and even a Wastes (which I can get with Field).
I also like Endbringer over Drowner of Hope.
I've played 2 online leagues with it so far and first went 3-2:
2-0 vs Storm, 2-0 vs. Jund, 2-0 vs. Serum Powder Eldrazi, 0-2 vs. GW Elves (a nightmare matchup) and 0-2 vs. 5C Humans.
And then managed to 5-0 on my second attempt:
2-1 vs. Mono-G Tron, 2-1 vs. Mono-G Tron, 2-0 vs. Mono-U Tron, 2-1 vs. RB Hollow One and 2-0 vs. Blue Moon.
Thalia has been great for me so far and I consider adding a 4th copy to the SB.
Here is my list:
4x Noble Hierarch
3x Thalia, Guardian of Thraben
4x Matter Reshaper
4x Eldrazi Displacer
1x Tireless Tracker
4x Thought-Knot Seer
4x Reality Smasher
1x Thragtusk
3x Endbringer
Sorcery (4)
4x Ancient Stirrings
Instant (4)
4x Path to Exile
4x Eldrazi Temple
4x Brushland
4x Windswept Heath
2x Temple Garden
2x Hashep Oasis
2x Field of Ruin
1x Sea Gate Wreckage
1x Gavony Township
2x Forest
1x Wastes
1x Plains
2x Ratchet Bomb
1x Pithing Needle
2x Fragmentize
2x Rest in Peace
2x Stony Silence
2x Tireless Tracker
2x Kitchen Finks
1x Nissa, Vital Force
1x Gideon Jura
The sideboard can probably be improved, the PW's were intended for the grindy midrange match-ups with lots of creature removal but they maybe unnecessary and the slots might be better used for removal (or even sweepers).
Fragmentize has been pretty good but might be better as Natural State for instant speed
(though it might be better in some corner cases against 4-cmc cards).
Damping Matrix seems like a much better option than Suppression Field (and can be found with Ancient Stirrings).
Linvala, Keeper of Silence isn't too bad either.
Also, is Drowner of Hope even worth it anymore over something like Endbringer ?
An unblockability spell isn't necessary in this deck.
It doesn't exactly affect the board (if you don't have a creature to pump) but seems to fit the deck better than Tamiyo.
My preferred PW for the deck would probably be Nissa, Vital Force though as all three abilities can be useful and she's has a high enough loyalty.
(https://www.mtggoldfish.com/deck/597614, https://www.mtggoldfish.com/deck/59298)
It also ran much less colored cards.
Ancient Stirrings also gets worse with the addition of so many colored spells (maybe Oath of Nissa becomes better for this list ?)
I find the upside of costing 1-mana (and 2-life) less not worth the Illusion-drawback.
It can help not run out of creatures and works well with the Scions and Matter Reshaper.
No one in their right mind would play Delver in Bant Eldrazi.
Is Primeval Titan the only reason ?
It works nicely with E.Displacer and "Revolt" can be triggered by scions.