williewillus Found it, it's a really rough design for a generating flower:
Amethyst flower
- new Amethyst Core block (or reuse another botania one idk)
- place core inside geode, flower outside geode
- flower must "see" the core in the same axis (not los) and only one core
- every 20 ticks, flower destroys all amethyst blocks around it with no drops
- if all amethyst blocks destroyed are exactly in the same relative positions as the budding amethyst in the geode, mana is produced relative to the amount
In other words, you set up a reference point within a geode and place the flower outside the geode. Then you replicate the structure of budding amethyst blocks around the reference block with regular amethyst blocks around the flower, and it eats all those amethyst blocks to generate mana. Would synergize quite well with the flower suggested here.