In Regrowth, I climbed the Thaumcraft and Witching Gadgets tech tree, burned about 500 Herbia Essentia, and energized a Pure Node earlier than probably was efficient in order to jumpstart a Terraformer to get even spotty coverage of a Plains biome.
Then I looked at the Witches' Brews, messed around for five minutes working on my Brewing Skill, realized that you don't /need/ brewing skill or even a coven to run center-on-cauldron rituals, and completely overwrote most of my work. /Really/ wish I understood Witchery better -- it took a goodly amount of Altar power, even with chalk circles, but this would have gone pretty quickly even before I got a familiar.
((The recipe is Mandrake, Netherwart, Tears of the Goddess, Diamond Vapor, Diamond, Blaze Rod, Water Artichoke Globe, Season Note, Tongue of Dog. Blaze Rod and Water Artichoke may not be necessary. I think you could cast this as soon as you get a Distillery running, though it'd take some work to hit the altar power requirements (~5k?) without a Wither Skull. Much much easier than trying to get enough of a coven for the Circle Rite of Shifting Seasons, or climbing either the blood magic or thaumcraft tech trees. The splash potion version is useless, though.))
There's a /lot/ of really powerful stuff in that system if you poke at it long enough.