also good for mono darkness...
If you are using devs, you don't need as much quanta. So maybe for that deck:
-1 cloak
-1 steal
-1 eclipse
-1 tower, 1 pend
+1 dusk
+4 siphon life.
or, if you want to go the stall route, using Sov's is quite nice - works well with devs, Sov, Siphons, vagger and vampires, with eclipse and steals.