A little more clarification on what I'm saying: banning Sand Veil as a whole would be banning an aspect of uncompetitive luck, but it would also be banning a bit of competitive luck as well (you took the risk of using sand, and you may have to pay the price; this isn't uncompetitive, it's the very opposite: what we've come to expect in Pokemon). However, if we go with a complex ban, you are banning only what is uncompetitive, and nothing more. It's better for precedent too, since in my mind banning Sand Veil itself takes you closer to the edge of the slippery slope, where you can argue for the banning of moves with less than 100% accuracy, critical hits, Scald burns, etc. To me, a complex ban can be employed when the positives completely outweigh the negative of having a complex ban, and this is one of those times.
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