L. Drake doesn't last very long. You can use it, but when you hit 65 I strongly recommend 2-piece Ancient White Dragon set for an additional 7 mp/regen so you can scrap your L. Drake set and its awful stats and go for something better --provided that you find a party to clear 1-1 Bonus all the way to 1-7, since 2-1 to 2-3 Bonus is really REALLY easy.
If that doesn't work out and you STILL have mana consumption problems, then get 4-piece Ancient Elf Hero set along with your AWD set or just learn how to conserve your mp better...
Deity, 70 + 77 Dainn, Inactive
BattleGod, 68 + 82 + 74 Sieg, Casual PvPer