On WoWLegacy's TC servers, and possibly other TC servers, since only legacy can screw up an almost perfect core, a paladin can Divine Intervention a warrior who is using bladestorm. Once the paladin is dead and the Bladestorm is up, the Warrior is free to move and attack as an unkillable block for 3 minutes.
Also weapon enchants such as Deathfrost and Lifestealing scale with Spell Power, so pretty much put this on any ret paladins weapon, then watch their attacks hit for twice the damage. Rogues can also use SP maces/daggers in one hand to gain some of the benefits of this bug.