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reply as to whether you want Black/White/Gray mixed together or not.  you still haven't specified.

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eh, i'll assume you don't want them mixed.  try this for Bank C2:

1) make a 54-byte ROM table of each Magic spell ID's desired position within its H/A/E category, with 0 being the first position.  it can go in any bank.

2)

Code:

hirom
header   ; comment out as needed

org $C255C1
JSR extra_attack
nop

org $C255CB
JSR extra_effect
nop

org $C255D5
JSR extra_healing
nop

; --------------------

org $C2????    ; pick a free address

extra_attack:
LDA $C2574B,X
bra common

extra_effect:
LDA $C25751,X
ADC #$18
bra common

extra_healing:
LDA $C25757,X
ADC #$2D

common:
phx
tyx
clc
adc new_table,x  ; new_table is 3-byte address
plx
rts

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now to give Bank C3 a shot:

Code:

hirom
header   ; comment out as needed

org $C34F7A

jsr extra1

loop:
jsr extra2
INC
INY
DEC $E0
bne loop
RTS

; ----------------

org $C3????   ; you find a free space address

extra1:
pha
tya
sta $e1   ; seeing as they're not using this half...
pla
rts

extra2:
pha
tax
lda new_table,x
clc
adc $e1
tax
pla
STA $7E9D89,X
rts

if i move "INC / INY" into extra2 and pull extra1 inline, it'll be a little faster.

then again, most of the slowness is coming from JSRing inside a loop.  maybe we should move that entire loop into extra2; it'll only take 6 more bytes.  likely worth the tradeoff.