Disclaimers and Credits: I completely stole this deck idea after playing one of CB!'s decks in T50 as I was experimenting with speed t50 farming decks. I have also seen a version by Jmizzle and also a whole spattering of similar speed rush decks based upon Cremation in the rainbow deck section & the Dual-Trio deck section.
What I bring to the table is adding a few Precogs to effectively reduce the deck size to 27. The primary purpose of this deck is to speed farm T50 for rares. It would probably do OK in PvP also. Like other decks of this type, you will either win or lose in 4-10 turns. It enables you to rip through T50 at a high rate of speed as you scour the board for rares.
Vreely's 27-card Fire Rush T50 KillerMark of 
The "Bones" of the deck:- Cremation x6
- Ray of Light x6
- Burning Tower x4
Cremation + Ray of Light. This is your structure and creates the speed quantum engine to power the rest of it. Normally hold your ray until you can sacrifice it the same turn you play it. Exceptions are when playing against speed poison, green rush, or any other deck type known to not have creature kill. A wonderful starting hand is 2 RoLs, 2 Cremations, a Ruby Dragon and a Lava Golem. Without adding anything to that you have a 4 turn kill if they don't get some defense out.
I did find it useful to put the 4 towers in so that way you can have another few cards to play in turn 1 or 2 in case you cannot slaughter a Ray. Also, a nice little alternate starting hand I hit often enough is RoL + Cremation + Tower + 2 Lava Destroyers. This hits for 14 on the first turn, then you have 2 earth to grow both and hit for 18 on the second turn.
The "Punch" of the deck:- Lava Destroyer x4
- Ruby Dragon x2
Doing your heavy lifting are these 6 bad boys It is not a hoard, but it does not take much if you can get a couple out early. Always play a couple Lava Destroyers over a Dragon because you do want to grow them as soon as possible to get them out of fire storm range. Go ahead and peck at them with the Rays if they are playing a deck without creature control, or if your precog tells you its safe for a couple of turns, or you only need a couple of extra points to finish the kill in 2 rounds.
The "Support" of the deck:- Unstoppable
- Explosion x3
- Thunderbolt
Bone Walls are annoying if they get one out in time. It prompted me to add the single Unstoppable to throw on your biggest Lava Destroyer and crack through for the kill. It only cost a single Gravity and if you have not cremated by this point you have already lost anyway.
Explosion is what it is. Mostly I hold one to bash down a Phase Shield on the final round. Other times they are used to take out hourglasses or Shards.
Thunderbolt is in there as a wild card. Again, it leverages the cremation and its generation of the single Aether needed. Sometimes a speed rainbow deck will get out a quick Oty, and that is just no fun. Playing T50, the dumb AI will often not wait for the Quintesence to immortalize it so the Thunderbolt can clean things up nicely. Also, its versatile enough to target the opponent if you are going to be within 5 points of a kill.
The "Twist" of the deck:This is my personal twist on the deck. If somebody is already using it, then I apologize. I have not seen it yet. Effectively these 3 precogs lower your deck to 27 cards. It makes use of the cremation's generation of a time quanta to do so. Also, it sure is useful to know if they have a fire storm in hand, or how many shields they have in hand so you can save enough explosions. Before I added the Unstoppable & Thunderbolt, I had 5 of these in the deck. It was fun, but also a bit much because each one relies on a Cremation/RoL pairing.
Summary:It performs extremely well at T50 level. It will almost always beat the green rush, and does always beat the poison rush. The standard Rainbow decks never have a chance to get out of bed, although the speed rainbow will sometimes catch you off guard.
The primary weakness of the deck is your initial draw. If you cannot pair a Cremation + RoL in 3 turns or less then you are most likely finished. A secondary weakness is the annoying flying Eternity or even just a few rewinds. A tertiary weakness is an Immortal Oty that can come out quicker than you can pump your Destroyers up. It does not happen often, but the PuppyChow Rainbow FG killer will catch you every once in awhile.
I have a completely un-upped version of the deck (
http://elementscommunity.org/forum/index.php/topic,3882.0.html) in the Dual/Trio Color section
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