fix(magic): lower ARCEUUS_COLOR detection threshold from 81 to 60

[orkabyte]

Summary

The ARCEUUS_COLOR detection threshold of 81 is too high, causing the Arceuus spellbook to be misidentified as Standard.
Testing shows the Arceuus spellbook only produces a color count of 71, which falls below the current threshold of 81. All other spellbooks correctly return 0 for ARCEUUS_COLOR, so lowering the threshold to 60 is safe.

Test Results

Spellbook	Arceuus Count	Ancient Count	Lunar Count
STANDARD	0	0	0
LUNAR	29	0	138
ANCIENT	0	111	0
ARCEUUS	71 ❌	0	0

With the threshold at 81, the Arceuus spellbook (count 71) fails detection and falls through to Standard.
Lowering the threshold to 60 fixes this while maintaining a safe margin above the next highest false-positive (29 from Lunar).