I made a similar version of the first-post deck as well. It's based off the same idea (Antimatter + Liquid Shadow), but doesn't use Quintessence + Maxwell's Demon:
4vc 4vc 4vc 4vc 4vc 4vc 4vc 4vc 4vc 4vc 4vn 4vn 4vn 4vn 4vn 4vn 5uk 5uk 5uk 5uk 5uk 5uk 5uu 5uu 5uu 5uu 5uu 5uu 5v0 5v0
The biggest problem I have when facing Obliterator is finding Antimatters. I tried the first-post deck (the one with the Quintessence + Maxwell's), but didn't like it much because I didn't see the point in getting out that 2-card combo. It's only nice if you get it out early, but having to wait 4 turns for a Quintessence is a pretty long wait (and that's only if you manage to get one of them, let alone the accompanying Maxwell). By that time most of the Shriekers are burrowed, and you can't use the Paradox ability on Dragons. The main focus, really, is to get those Antimatters out, and you don't really need Maxwell to get rid of the Shriekers. The Entropy mark really helps with getting out Antimatter. Also, with 30 cards instead of 32, you have a better chance of drawing an Antimatter.
Basically this deck is a version of this one (
http://elementscommunity.org/forum/index.php/topic,11074.0.html), except with Voodoo Dolls in place of Dusk Mantles (because the Dusk Mantles would get pulvarized anyway). I like the Voodoo Dolls because Obliterator is dumb enough to Gravity Pull them (good for a small amount of damage), and they can give you a turn to stall while you try to find an Antimatter.