15% damage buff for 1 minute - any class - stays after changing zones

[buzzler]

Quite simple, few mobs in blasted lands cast this debuff on you: Feltaint - Spell - World of Warcraft (+15% damage dealt and +15% damage taken). You could have someone to summon you on a boss, and accept the summon right after receiving this debuff for almost 1 minute of 15% extra damage.

[buzzler]

While at it, here is similar buff: Curse of the Shattered Hand - Spell - World of Warcraft --- 5% dmg done and 15% taken, for 3 minutes. Also makes you red and bigger.

Both these buffs are approx. worth same as an extra bloodlust, or 2 extra potions. But requires couple minutes of work and a group willing use it.