There must have been some major changes since these posts were made. I have only won 1 match of 15 with either of the 2 unupped versions of the deck listed here. Even against Oblivion. The AI usually has 5-6 creatures out before being able to get off the first Antimatter. What am I missing with this?
Only use Antimatter on the Dragons. If you Antimatter the Shriekers, you've pretty much wasted one since it will burrow after you Antimatter it. If you can, Paradox the Shriekers with a Maxwell's Demon instead.
If you were using the trio version of Liquid Antimatter, then that might have given you some unstable draws. Even the unupped version of the Maxwell/Antimatter/Fractal Purple Dragon deck in the first post should work decently since it's more consistent.