I think I am finally starting to realize how much of a grind is ahead of me. 31 runs through Box of Desires 1 last night for 5 metal mimics. Still need 3 more for 6 star evolution on my main summons. I'll need several more metal parades to get them the xp required for evolution. I'll need to farm some miracle totems. Then I'll need to run the xp dungeon until my eyes bleed again next Monday to get enough capacity to actually use the six star units. Then I have to farm hundreds of feeder units per 6 star to start working on BB leveling. Then SBB leveling.
My brain hurts just thinking about all of it...
It goes faster than you think, and the metal mimics are best if done through evolution (my opinion). Metal Ghost + Metal King + Metal God + Bat Mimic = Metal Mimic. The hardest part will be grinding the rank to get all of the 6* in. Honestly, work on your main team for grinding (as that's what you'll do the most of). My team is relatively unchanged with a few "swap outs" for weak elements (Elza lead, Darvanshel, Zelnite, Maxwell, Ulkina, and I'll swap out whoever is weak to someone who is strong for elemental vulnerability). Once you have team cost for All 6*, you will have started filling in other team members/slots for utility positions, trials, GCC, etc.
Break it into segments:
1) get team cost to use your current team plus your target at 6*
2) get all your 5* to max level
3) get all the evo materials for your 6*
4) evolve your 6*
then repeat it for each unit.
As you are leveling, feed off the crappy units to raise your BB/SBB.
Remember, it halves when they evolve (rounded down), so only max 6* or 5* if all of your 6* are max SBB. As well, it's [almost] ALWAYS cheaper to level a max-level's BB/SBB, so wait until then if gold is an issue (it quickly won't be).