Battle priest

[Manifus]

While luk does increase the chance for TU to work, it doesn't seem like it helps enough to be worth it.

Against anubis, 99 int gives 41% chance + all those other bonuses of int.
70 Luk/Int gives 45% yes, but sacrificing that many stat points for such a minor increase (this is not including cast time or survivability.)

Add luk at your own risk. (Also getting 99 int and 40 luk gives about the same effect, 45%, as 70/70 int/luk would.) Again, Ask yourself if you think a minor increase is worth it, and note that even with luk gears and 99 base int/luk + buffs you are not likely to get much over 60%

Again, you'll also be sacrificing cast time at that point.