I just got back to Elements after more than a year away and a couple of updates. Besides trying to get my shards, I am trying to get back to playing one game a day against the Oracle's predicted False God.
Today I got Dark Matter, and looked here to see what people were saying, but didn't see any decks that looked better than what I had used back then to beat him twice after a long string of losses. Got a very easy EM despite getting black holed on turn 2 and having Titan and a dragon against me.
Wildlife Sanctuary (Freeze or Be Eaten):
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Get a sanctuary down as soon as possible. Try not to play things unquinted, but if you have Mindgate out and his hand is clogged, you have a margin of safety. Today I played my two Quints on an Octopus and an Otyugh, and eventually got away with playing a Lava Destroyer unprotected because I was down to 18 cards, and he wasn't gravity forcing his last antimattered critter. But the deck can deal damage fast once it gets going, so that might have been unnecessary. A Lava Destroyer will deal 187 points in 11 turns, so I probably should have waited.
The key cards for control are the Octopus and the Otyugh. You can freeze what isn't antimattered, including his weapon via your Voodoo Doll. Heals are there to provide EM, and can help if you have trouble with healing, which you really shouldn't. As was mentioned elsewhere, don't waste a Supernova until you have a Light quantum and a Sanctuary to play.
Sadly, most of this deck does need to be upped. The towers in order to get quatna fast enough in the beginning to have a chance at getting Sanctuary down, and the Supernova and Sanctuary cards also toward that end, and the Otyugh in order to be able to start eating on the Nymphs before moving up to the tastier damage dealers. Fortunately, Quantum Towers and Supernovae are early ups for most people. You could try it with the other cards unupped.