Absorb

[Forfeit]

It's still a horrible idea.  It'd literally be extra (and bad) copies of life drain.  Think about it.

Life drain: Blast an opponent's critter with it, and you gain life equal to its toughness, and since it doesn't *swing* at you the next turn, also gain life equal to its attack.  Many times over, in fact.  Furthermore, you can also point it at your opponent's *face*.  By the time your opponent has a sizable critter on the board, you should have the corresponding darkness mana to blast said critter with a lifedrain.

And if you're running other colors (death): Why would you need any more life drain beyond the darkness card?  Just gun for your opponent's head and race him with arsenic and deadly poison!

I was thinking how this would be a good card for those decks without much darness, it could even be used with novas, not something you'd do with lifedarin. And it could help against a all weapon deck when you have no way of gaining life from your opponent. However, it is way worse than lifedrain.

[Demongod]

Without much darkness?  What deck splashes darkness, and for what reason? 

I guess a poison player can splash darkness to drop parasites for their infection ability.  Other than that, let's review the darkness cards:

Dusk shield: If you're splashing for defense, splash light for the sundials, because you get 2 cards drawn with that.
Life Drain: Dark only card.
Steal: A great card for rainbow, but if you're running earth, you should splash gravity to use pulverizer instead, or if using gravity, splash earth to pay for its initial drop.  Explosion is also far cheaper as a splasher, and sometimes you don't want to override your own weapon or shield.
Dragon: Splash for dragon?  WTF?
Nightfall: Darkness+poison does not work well together, that it does not.  Those of us who have played incarnate and beaten him just about every single time know this.  Granted, he could have packed pests and steals, too, but that probably wouldn't have made him much better.
Vampiric dagger: LOL?

So once again...this card fails.  You only splash dark for steal.

Other colors:
Light: Upped sundials.
Fire: Explosion
Earth: I'm not sure whether Earth/Time/Water can work by just going on a massive quanta-killing spree and rolling over with a couple of big monsters...