-DuskDim+1 was used by my friend to achieve the +INT.
-SnowDims can add +20MAB/+20MACC or raw +25MAB.
-LeafDims can be used to get up to 6% FastCast or 6%MagicBurst bonus damage.
Quote from Byrthnoth who mathed it out on BG:
Probably possible to get INT+25, MAcc+20, MAB+20, and FC+6.
Gives it a total of 37 INT, 48 MAB, 217 MDmg, 20 MAcc, and 228 MAcc skill.
Laevatienn has: 0 INT, 60 MAB, 248 MDmg, 10 MAcc, and 255 MAcc skill.
Tupsimati has: 0 INT, 40 MAB, 248 MDmg, 30 MAcc, and 255 MAcc skill.
Without AM, it would be better than Tupsi for damage on most spells but likely worse than it for MAcc.
Without AM it might actually be better than Laev for both MAcc and damage on most spells. MDmg-31, MAB-12, but INT+37. If you have an M of at least 2 (basically Tier 2 or higher), 37 INT is going to translate to 74 MDmg or more. That compensates for the 31 MDmg deficit with damage to spare.
So yeah, that staff is basically a mythic killer (without AM).