Forgive me, but using Necromancer's mines is really not the best option. It's better to summon a phoenix, fire warriors, phantoms, and cast Heavenly Shields on a Kshatriya Rakshasa, and someone else with a Mage's Mark.
And if a Necromancer plays defensively against a Wizard, that's a 99% chance of defeat. The Wizard needs to be eliminated as quickly as possible, at least because the Wizard has three ranged attackers and a whole lot of different useful spells.