I wrote a blank Mystcraft age and got a dimension that has an infinite Manyullyn lake at y = 40.
I'm endlessly ender-tanking it into my smeltery, casting it into blocks, and, every-so-often-when-I-need-resources, transmute a few blocks of Manyullyn (which I have almost an Obsidian chest full of) into a couple of stacks of diamond blocks.
In plainer language: using Mystcraft, I got free infinite Tinkers' Construct top-tier molten metal, pumped and transported it across dimensions, am constantly automatically casting the Manyullyn into blocks (for easier storage), and sometimes using EE3-beta's Minium Stone to transmute the Manyullyn blocks into blocks of diamond and blocks of gold.
Crazy, right? And it's all free. Except for the transmutations burning through my Minium Stone; however, with my surplus of Minium shards, that's not such a problem.