This is a silly deck.
Spam grenadins and slay dudes. It's completely possible to get god-awful hands and lose. Shit gets real crazy when you don't.
Disassembler is a do-shit card, and don't let anyone tell you otherwise.
Toppletower is your worst 3-power card. Spike is either your best or your worst card at 5.
I like Combustion Cell because it can power up an early Spike, Tank, or Cruncher, but it's worth noting that on turn 3 Spike is probably useless, especially if you spent T2 playing the cell. However, with the amount of power we're running, you can often have multiple cards in hand on 5, so I like it over Altar.
We don't get Sigils consistently enough to run the stonescar chair. I like it like this, but running Diplomatic Seals may be correct. Double shadow requirement may necessitate this power base. I'm pretty sure that Crest is essential.
Combust
x4
1
Grenadin Drone
x4
1
Ticking Grenadin
x4
1
Torch
x4
2
Combustion Cell
x4
2
Devour
x4
2
Disassembler
x4
2
Quarry
x4
3
Assembly Line
x4
3
Toppletower
x4
5
Oblivion Spike
x4
5
Scraptank
x4
7
Gearcruncher
x2
Fire Sigil
x5
Shadow Sigil
x8
Crest of Chaos
x4
Granite Waystone
x4
Stonescar Banner
x4
View Deck on Shiftstoned
Because Oblivion spike in sacrifice decks does one of two things: Smashes opponents face or is a removal spell. Lets assume you've only got 3 cards in your void by turn 5. You play Oblivion spike and you've got a 3/5 weapon, really on turn 5 a 3/5 weapon vs a 3/3 weapon isn't that big of a difference.
However lets say you have 8 cards in your void. Suddenly a 5 mana Sword of the Sky King is looking pretty good over a 8/5 weapon. And with multiple ways to create grenadin out of thin air your void is going to get huge eventually so slapping down lets say a 20/20 weapon is not out of question.
Other ideas I have but might be too crowded for this: Running Annihilate is a good idea with so many big mono color creatures that got released. And of course the combo of Madness+Devour or Madness+Combust is extremely tilting to be on the receiving end of. But again, cutting cards for these is going to be challenging.