1 -

+

= already said: invincible pests + gargoyles + earthquakes
2 -

+

= already said: fractalling devourers and swarm your field with them. Let's play a solitaire

3 -

+

part 1 = Lycans, liquid mattering and eventually one or two discords to slow your foe down
4 -

+

part 2 = voodoo dolls + pandemonium: watch as his creatures get screwed while your dolls reflect back every damage they take and gain some nasty effects; you can power them as well with chaos power (and if their health drops it's damage to your opponent)
5 -

+

= Gravity pull your voodoo dolls and throw back whatever damage they take to your opponent
6 -

+

= Ghostmare ftw
7 -

+

= already said. parasites + eclipse + bone wall = invincible + huge creature cc
7 -

+

= deal 5 damage every time you rage potion a doll, as well as powering it up
8 -

+

= adrenaline + vampires = big heals
9 -

+

= blessed vampires + luciferin + hope = huge heals + wall; add in vampire crusaders (stiletto)
10 -

+

= flooding + nymph's tears = your opponent is limited to 5 creatures that you constantly poison (LS) to death thanks to your dark nymph summoning; you can also LS your own voodoo dolls reflecting the poison to your opponent (and eventually gain a 2x vampiric damage with eclipse)
11 -

+

= constant vampire dagger animating + doubling the heal income from said animated daggers via Sky Blitz = outheal almost any damage you take (not sure if animated weapons are airborne, but still animated daggers + vampires make a huge heal)
There are so much ways to use darkness I can't really pick a choice
P.S.: Said order is just random, it doesn't say if a deck is better than another.