Your opponent is using krak missiles to negate your WBB, correct? Well each krak missile can only take out one model per turn so he's not going to be killing you very quickly. Besides a Resurrection Orb (which you should always have in your army) within range easily guaruntees you have your WBB.

Destroyer Lords already move 12" a turn (24" if he turboboosts). With that much movement he won't need that VoD. I suggest any combination of Lighting Field, Phase Shifter and Phylactery.

 

The necron VS guard fight is probably easier for the necron player - you have multiple options.
Destroyers are absolutely amazing against the guard.
Infiltrate your flayed ones to tie them up in close combat. It doesn't matter if they die too much, as long as they buy you enough time to get your toasters into range.

Do you have any scarabs about? These are also great for simply flying in his face to generally be a nuisance.

As soon as he starts playing with anykind of armour (always silly against Necrons) give your scarabs disruption fields and watch the fun.

Really, you only have to start watching out if he starts using Roughriders - who can really hurt necrons.

Happy harvesting

 

Never underestimate how many heavy weapons guard can get into their army. Their heavy support can have squads with 3 heavy weapons. They also have access to demo charges.

And 150+ lasguns will mow down even necrons.

To combat this the res orb is a must. Field 2. Get rid of the C'Tan. Its a points sink. A clever player will phase you out and never worry about the C'Tan. Only people with nothing better to do waste their time shooting at it.

 

Ok for starters get rid of the nightbringer. Waste of points in such a small battle. Secondly a destroyer body and warscythe is for a CC lord, yet you give him a VoD. After you deepstrike you cant assault so therefor your lord short be a foot lord that way he can shoot the SoL and save yourself some points on wargear. Get another squad of 4 destroyers with the points from the nightbringer, 2 more flayed ones and chuck the rest of the points into either immortals or more warriors or wraiths, depending on how many points you have left over

 

I second evil_exodus. At 1500 pts you could also consider a Monolith, which performs really well against IG if you deepstrike it into the enemy deployment zone.

Do you know what mission you will be playing?