I've done LA builds before and I really struggled with upkeep for this build. I previously tried running EB to sustain LA's extreme mana cost but it wasn't too great, but I didn't like the idea of using Blood Magic with LGoH or high regen either. So I turned to Thief's Torment as the ideal solution, as it allows you to skip both Blood Magic and LGoH as supports and essentially socket 0 damage supports to LA without having to invest passives into sustain at all.