Ancestral Call

EDIT EDIT: In The War Within, at level 80 all of the bonuses are +5054 to a secondary stat:

EDIT: In Dragonflight, at level 70 all of the bonuses are +599 to a secondary stat:

In Shadowlands, at level 60 all of the bonuses are +125 to a secondary stat:

[spell=274739] +5054 Critical Strike
[spell=274740] +5054 Haste
[spell=274741] +5054 Mastery
[spell=274742] +5054 Versatility

This racial provides a random bonus to either versatility, mastery, critical strike or haste for 15 seconds on a 2 minute cooldown.

At level 120, all of these bonuses are of a value of 411.
I tested these on a Fury Warrior, so the percentages may vary from class to class (and from spec to spec)

Ferocity of the Frostwolf increased mastery by 8%
Might of the Blackrock increased versatility by 5%
Zeal of the Burning Blade increased haste by 6%
Rictus of the Laughing Skull increased critical strike by 6%

Ancestral Call grants one of the following buffs at random for 15 seconds (2 minute cooldown):

Ferocity of the Frostwolf Increases mastery by 102
Might of the Blackrock Increases versatility by 102
Zeal of the Burning Blade Increases haste by 102
Rictus of the Laughing Skull Increases critical strike by 102