personally, i think Forerunner of Slaughter is the best card in this deck. I think it should be a four of. Also, Reality Smasher is ridiculously good. I don't believe Vile Aggregate is amazing, but it is up to you and how your playtesting works out for that one. I also don't really care for Dominator Drone, as it a 3/2 for 3 that pings for 2. I feel that it should be replaced by something else. I also like Dust Stalker, a 5/3 with haste is decent, but sometimes it is just a four mana Lava Axe. I also feel that Eldrazi Obligator should be sideboard against abzan to take their siege rhino.

I partly agree with the above. I like 4x Forerunner of Slaughter but like Vile Aggregate. I don't mind Dust Stalker. I've beaten down many an opponent with juggernaut back in the day. The card that I think is a stinker in your current build is the Reaver Drone. I like Sludge Crawler a bit more. Even though it doesn't fit the deck theme, in my deck I included 3x Kolaghan, the Storm's Fury for flying protection or a quick 5 damage minimum. I am thinking max 2x of the Ghostfire Blade (personally would cut as it means no creature gets cast turn two.)

I agree with you on Ghostfire Blade to a certain extent. I never really thought they were the godsend everyone else seemed to think. However, I've played them at 2 and that wasn't enough to make them worth it. Secondly, they seemed to come out either turn 1 or late game when I play them. Granted I was playing Kozilek's Sentinel and I was casting it more because it was a colorless spell not the immediate buff. As for Kolaghan, it's a Dragon so I'm not sold on it. Also, I do have a flyer, which with a ghostfire blade would be at least dealing 5 per turn. Have you met Bearer of Silence? . And I'm on the same page with you about Vile Aggregates as well, I love them when I have one creature and I love them when I have 5 or 7. Which is why I only dropped to 3 copies.

So I played the deck against like a 4 color Control brew my friend is playing that utilizes Jace, Vryn's Prodigy and Sphinx's Tutelage and won 2-0. Tutelage doesn't hurt this deck too much and I swarmed enough to keep his Jace's under control enough to kill him. Then I played against another friend's Mardu tokens and lost 2-1. I was winning and had him at 1 life but then pulled out Sorin, Solemn Visitor and pulled up. Then I drew mostly lands and that was that. I love how the deck plays. Forerunner of Slaughter and Vile Aggregate are amazing. I also regret not having a playset of Reality Smasher because it's amazing.Flayer Drone is slightly more underwhelming than I thought so I'll keep testing to see what I can do with it. After the testing today, we determined I didn't have enough colorless sources so we fixed that. Which also means I am wider in white. Thinking about mainboarding Sorin but not sure yet. If I don't I learned it's amazing in a mirror match.

Tomb of the Spirit Dragon is an absolute necessity in any eldrazi deck right now. Especially if you're running cheap aggro creatures... The health you can gain in one turn in the mid-late game of standard is literally unbalanced. Other than that I would recommend looking at cards like Kozilek's Return, Oblivion Strike, Titan's Presence, Sifter of Skulls, Dread Defiler, Deathless Behemoth, Endless One.

In terms of Bearer of Silence, I have it in a Sultai deck that utilizes it primarily as a removal spell. With the other cards I listed you can keep it in your hand as a sneaky ninja waiting to remove their big threat before becoming like a mosquito that hits without resistance for 2 every turn.

In the last version of this deck, I was curving out every turn. In that build, Tomb of the Spirit Dragon is useless because its net worth is about 3 life per game, towards the end game. Which isn't worth it. I'll play around with it in this build but I think it'll be a somewhat similar experience. In response to the rest of the cards you mentioned, Kozilek's Return Kills all my creatures except for 3. Wouldn't play that mainboard. Maybe a SB option. I don't like Oblivion Strike. I feel it's too expensive and if I would rather play more copies of Thought-Knot Seer but I don't want more of those either. Titan's Presence I will consider for SB. I would play Sifter of Skulls if it also counted when it dies, which sadly it doesn't. Dread Defiler is WAY out of my mana curve. With this deck, by the time that turn comes around one of us should be dead. IF I can get to that amount of mana, I still wouldn't play it. Too expensive. I don't like Deathless Behemoth. I don't even draft it. I have better things to spend my mana on. I had Endless One in a previous version of this deck. It really doesn't put enough pressure on my opponent. Especially after I pump it full of mana, it just typically gets exiled. As for Bearer of Silence, I thought of it that way for a while as well. But it can't force my opponent to choose their threat to sac, so it's not as useful. Here's an example, Elf deck: sac a token. No worries. Rally deck: sac anything but Jace, (which is helping them) and possible Zulaport Cutthroat trigger. Any token/scion producing deck just sacs a token. Against a control match-up I would probably bring it in, but other than that, there are better ways to remove things. Which is why I'm now playing Grasp of Darkness and Spatial Contortion. Whew. I'll play around with the two I was unsure about. Thank you for the suggestions!