Intervene

This macro will change your stance to Defensive Stance if you are not in that stance and cast Intervene based on the following conditions:

1. If target is friendly, then cast Intervene
2. If target is hostile, then cast Intervene on the target's target if it's friendly.

#showtooltip Intervene
/cast [nostance:2] Defensive Stance; [help] Intervene; [target=targettarget, help] Intervene

All-in-One Taunt

This macro will perform the following actions:

1. Casts Challenging Shout when used in conjuction with alt key.
2. Changes stance to Battle Stance and casts Mocking Blow, when used in conjunction with control key.
3. Casts Taunt.

#showtooltip Taunt 
/cast [modifier:alt] Challenging Shout;[modifier:ctrl,nostance:1] Battle Stance; [modifier:ctrl,stance:1] Mocking Blow; [stance:2] Taunt; [nostance:2] Defensive Stance

Stance Dancing

This macro will put you in Berserker Stance, casts Berserker Rage and change your stance to Defensive stance if shield is equipped, or Battle Stance if no shield is equipped. This macro is useful for breaking fear on bosses such as Nightbane and Onyxia.

#showtooltip Berserker Rage 
/cast [stance:3] Berserker Rage; Berserker Stance 
/cast [noequipped:shields] Battle Stance; Defensive Stance

Mouseover Sunder Armor

This macro will cast Sunder Armor on a mouseover target without losing your current target. It's usefull for placing Sunder Armor on crowd-controlled mob as Sunder Armor causes zero damage and the target is not being auto-attacked.

#show Sunder Armor
/cast [target=mouseover, exists, harm] Sunder Armor; Sunder Armor

Revenge and Heroic Strike

This macro will cast Revenge when it's up and Heroic Strike during its cooldown.

#show Revenge
/cast Revenge
/stopcasting
/cast Heroic Strike

Shield Slam and Devastate

This macro will cast Shield Slam when it's up and Devastate during its cooldown.

#show Shield Slam
/cast Shield Slam
/stopcasting
/cast Devastate