I hope I've missed something in this interpretation, but it appears to me by RAW that a Wizard with the Necromancy Life subschool, the Heighten-Spell metamagic feat and the Magical-Lineage trait buffing the Disrupt Undead spell would be able to produce an infinite amount of out of combat healing by just spamming Disrupt Undead at his allies.
The Life subschool's Healing Grace power allows the Necromancer to heal one of the targets of his spells 1 hp (or up to 3 at higher levels) per level of the spell.
If my reading is correct: by using Heighten Spell and Magical Lineage in concert to buff the "effective" level of Disrupt Undead to 1 while keeping it's "actual" level at 0 it would allow the necromancer to heal a party member by 1 point every time they cast Disrupt Undead at them.
I really hope this is not the case as it would make a 1 level wizard dip a bit insane.