With the addition of new and exciting units, the odds worsen for the player hoping to get a specific unit for promoting his other units. Since I've been playing, a large amount of new units have been introduced. Broadening the pool of units is exciting, but at the same time it's frustrating to see our gold chest odds get worse week by week. I suggest retiring some of the Rare units, starting with the universally despised Apollo Nuke/Great Bombard/Might of the Worker.