Most of this is based on observation and memory – I also suck at math, so if I screwed up, let me know and I’ll fix it.
----R48 BOOST SUMMARY:----
2-Color Stockpiles
Adds 1 AP of indicated colors
Can be stacked 5 times (max 5+ indicated colors)
x5 @ 200 ISO
Rainbow Stockpiles
Adds 1 AP of every color
Can be stacked 5 times (max 5+ every color)
x5 @ 50HP
Rainbow Damage Boost
+20% match damages on all color (max +100% damage increase)
Can be stacked 5 times
x5 @ 50HP
2-Color Damage Boost
+10% match damages on indicated colors (max +50% damage increase)
Can be stacked 5 times
x5 @ 200 ISO
Critical Boost
+25% crit bonus
Can be stacked 5 times (max +125%)
x5 @ 200 ISO
I haven’t seen any character type specific boosts yet, so I think these are permanently retired.
---- 2-COLOR STOCKPILE BREAKDOWN----
2-Color Stockpile (original)
+3 of indicated x3 @ 100iso
~5.6 ISO per AP
2-Color Stockpile (R47)
+3 of indicated x3 @ 200iso
** 100% price increase
~11.1 ISO per AP
2-Color Stockpile (R48)
+1 of indicated x5 @ 200
20 ISO per AP
**400% price increase overall / two-fold increase from R47 + added ability to stack
---- RAINBOW STOCKPILE BREAKDOWN----
Rainbow Stockpiles (original)
+3 all AP x3 @ 200 ISO
*ISO cost replaced with HP
Rainbow Stockpiles (R47)
+3 all AP x3 @ 100HP
~1.9 HP per AP
Rainbow Stockpiles (R48)
+1 all AP x5 @ 50HP
~1.7 HP per AP
~10% decrease in cost + ability to stack
----SUMMARY OF CHANGES----
*** RAINBOW STOCKPILE: ~10% decrease in cost + ability to stack
*** RAINBOW DAMAGE+: +150% effectiveness, +2 boosts per purchase, -50% cost, and the ability to stack
*** 2-COLOR STOCKPILE: 55% cost increase and the ability to stack
*** 2-COLOR DAMAGE +2 boosts (20%+) per purchase and the ability to stack
*** CRIT DAMAGE: +150% effectiveness, +2 boosts per purchase, and the ability to stack