Then they shoot the basilisks that are in range of the wraithcannons and in the assault phase charge a heavy weapons squad
Just realised about this (sorry) the new rules about shooting and assault - you can only assault the unit that you shot at (apparently). I assume this would hold true for the Basilisk as well. Mind you, if the Wraithguard are fortuned, and if the Waveserpent had twin Brightlances on it - you could.... Charge for the side armour and disgorge the wraithguard, then fire the Brightlances at the side armour of the Basilisk, 4+ to hit with re-roll gives a 3 in 4 chance to hit with a 5 in 6 chance of affecting it - 2 in 3 chance of penetration (fnar fnar, yuk yuk) - a 62.5% chance of both hitting and rolling on one of the vehicle damage tables and 50% chance of both hitting and rolling on the penetration table. Then, assuming that you've at least stopped it shooting, the Wraithguard can open up on the troops and charge in (to prevent them getting shot during the opponent's go).
The problem with the above is that wraithcannon only have a range on 12" which (assuming that the opposition has "5 lines of 20 guardsmen" - as, apparently, Maureth has his units organised) will make things a little hot for the wraithguard! That was the reason that I was suggesting the Shining Spears - they can "snipe" from just inside 36" (also - with a 2+ to hit, they have a 5 in 6 chance, better than the waveserpent's twinned bright lances - this works out as just under 69.5% chance of both hitting and rolling on a damage table and just over 55.5% chance of both hitting and rolling on the penetration table) and, once they've managed to knock out the Basilisk(s), the IG guardsmen will be protecting one or more smoking craters(s!) 36" away from doing any harm. Assuming that the sides are about 2000 points, you will have managed to knock out almost half the points in his army (the basilisks have gone, or can't shoot any more, and the guards protecting them are out of the main area - just keep an eye on any lascannons/Missile Launchers that they've got!).
This should allow the rest of the Eldar army to attack the remaining IG forces at a 2 to 1 point advantage.
Have I missed anything on this? Ideas for tightening up the plan would be good - 'cos it could be adapted for units other than Basilisks!
Of course this all goes to pot if what happened to me the other night happens to you - two Shining Spear "tank buster" units - first two turns - I roll a 1 for each of them. turn three, one of the Exarchs is blown away and then the other one shoots - another 1! The chances are slim of this sort of thing happening (1 in 6
5 - or 0.013% - 1 in 7776!) but the best laid plans can be scuppered by outrageous dice rolls (your's or your opponents). My normal opponent makes his 5+ invulnerable save 9 out of 10 times and has his deep strikers go "double one" about one in three times - go figure!!