[Gatts]

Spreading is not bad idea, but let me tell why I focused so much for INT instead anything else as a mage:

If I played UDNEAD:
phantom % increases by your INT... so if you can have INT 50+ ... your phantomed unit can pretty deliver nice damage and last full 2 rounds and still be able to kill a lot with last attack!

If I played living fuss army;
GOD ARMOR % increases by INT - you can make one of your TANK units quite invulnerable up to 70% resistance... place it so far away that the dragons attacking this suicide unit won't have any chance of "touching" your flank/rare units - archers... than you can resurrect/buff your tank suiciders as long you can use your spells/skills wiseley (Lina's charges, magic spring etc.)

Each of these tactics works perfectly against units with huge resistance or immunity to damage units (and there are plenty more... plenty more tactics where your ATT/DEF is not important at all)