[BUG] Gamebreaking Poison Bug

Mutilate Rogues' deadly poison is currently benefiting from the Master Poisoner debuff (+8% spell damage taken) for each stack of deadly poison on the target.

If a Mut. Rogue has 5 stacks of deadly poison on the target, it will take +40% spell damage (8% * 5 stacks) from all sources.

This is a game-breaking bug as the same thing happened in WotLK when our poisons gave the 3% crit debuff, and a 5 stack of deadly was giving +15% crit chance