Here's my coin projections for the Kyurem Escalation.
Level 50: can be done itemless. Depending on if you're struggling and how much, Time+10 or Attack Up can help (0, 800, 3000)
Level 100: I did this with just Attack Up, but it was close. Attack Up and Time+10 should be more than enough. (3000, 3800)
Level 150: Can be done with Time+10, DD, and Attack Up. I decided to have peace of mind and used Attack Up and Complexity (5300, 12000)
Through 150, I used a Pure Pyre M-Blaze team on the boss levels. I did use Pyre featuring M-Lucario on levels 61-70, but that's about the only time I used M-Lucario, except to test the water on other level formats when I wanted to see what I was most comfortable using.
Level 200: I am seriously considering M-Ray for the final 3 boss levels, and there have been quite a few people ahead of me who've used that team to great success. Full items from here on out. (16300)
Level 250: See 200 (16300)
Level 300: Same as 200, except prepared to use a jewel if I come up short. Should be close. (16300)
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Possible extra expenditures below
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191-199: This is one of the hell gaps. I'm only at 183 right now, but I've heard horror stories about this. Should be relatively easy to do itemless early on, but you may be tempted to throw in a Time+10 towards the end. Some have even used DD in addition. If you can't do it itemless or with just Time+10 early on, I would likely advise against going for 300 unless you have spare jewels to burn. (0, 0-7200, 0-20700)
281-299: Another hell gap, but somewhat easier than 191-199 from the mouths of those who've gotten this far. Still, itemless, Time+10, or Time+10 and DD throughout. I really advise against 300 if you have to do the most costly early on. (0, 0-15200, 0-41400)
Total projected costs (boss levels only, assuming no failures): 57200 minimum, 67700 maximum.
You can adjust these projected costs based on how you cope with 191-199 and 281-299, although I feel like the people willing and able to get that far might only need to use the occasional item, if at all.