I probably wouldn't recommend it for a pure. The minimum stats are 78 attack, 78 strength, 55 summoning and 10 defense to get it. Not to mention there are many quests and high level skill stats to obtain:
- 80 Magic
- 71 Firemaking
- 70 Construction
- 70 Crafting
- 70 Smithing
This will add way too many cb levels for it to be an effective pure. If you absolutely must do it, then the following stats would be ideal:
80 attack with 80 dung for Chaotic Rapier
99 strength
20 defense for initiative and corrupt armour
But really it is not a weapon for pures