Abacus of Violent Odds


 * Once the prized possession of Pathaleon the Calculator, its odds eventually stacked against him.

Source
This item drops from Pathaleon the Calculator in the Mechanar wing of the Tempest Keep.

Effective Haste
Assuming this trinket were activated every cooldown, it would grant: 260 * 10 / 120 = 260 * 1 / 12 = 260 / 12 = 13.33 Haste Rating (0.84% Haste at 70, 0.41% Haste at 80)