This is from memory, so bare with the mistakes. It uses two flaws and Easy Metamagic for early entry.
Beguiler 4+ Shadow Adept 1 + Shadowcraft Mage 5 + Shadowcrafter 10
Feats: Heighten spell(f), Shadow weave magic(f), Spell focus: illusion(1), Easy Metamagic(3), Insidious magic + pernicious magic+ tenacious magic (SA level 1 @ level 5), Greater spell focus: illusion(6), Earth sense(9), earth spell(12), Residual magic(15), Arcane Disciple: luck(18)
Thoughts?