This is my version of the well known "Ordnance Scavenger OTK" combo from a while back. Gameplan for the uninitiated:
1) While not really playing units apart from Merchants or putting up any defense, get up to 6 power, including 1 each of Fire/Justice/Time influence, and 2 Shadow influence (NOTE: this deck plays a lot of Transmute 5 powers to work, so play them first if possible to reserve real powers for the sixth)
2) While doing so, grab a Shiftstone Processor and Ordnance Scavenger from the Market with various Merchants/Fearless Crescendo
3) Make sure to get the Shifstone Processor in play, pray it sticks
4) As soon as possible (preferably on turn 6) play Ordnance Scavenger, which discards your whole deck (generating loads of power via Shiftstone Processor) then draws an item
At this point things can branch a bit (depending on what is in play, how much is left in your hand, how much power you generated), but the general flow from here is to WIN THIS TURN
5) Play Surgeon's Saw to get a Shadow merchant into hand if there's none already there
6) Use the Shadow Merchant to swap/grab the Dumping Ground
7) Play the Dumping Ground (sac a unit if power allows and you want to wipe/weaken the enemy board a bit)
8) Activate Dumping Ground's ultimate to play one gigantic Gravewatch Guardian (charge+overwhelm), and one Grinva, Judge of Battles as insurance
9) Attack and win!