Haha I didn’t know. I thought the guarantee had been there since day 1. Its no wonder the community was so bummed out when it got removed (the devs gave a gift and took it back lol)
I remember one guy saying that he spent $1000 just to get gazer when it was first introduced.
Imagine this
4% chance to hatch a legendary and no boost for featured monsters. It was nearly impossible to get the feature legendary
And after one week the monster broke pvp and was banned then nerfed to the ground.
The dude must have plucked out all the hair from his entire body in frustration 
or if he had his way he would have sent ninja assassins after the devs lol.