While creatures having timers isnt a brand new concept to Magic, here the summons add another layer of thought to the gameplay
If we go by a certain commander recommendation websites stats, this hits 28/100 of the most often played commanders from the past few months, among them high value targets such as Breya, Chulane, Jhoira, Jodah, Kinnan, Winota, Sisay, Zur and several others
As you might expect from a something controlled by a corporation in the Fallout universe (and in real life, badumtish), it was a front for shady mad science
The Ooze is able to recycle lost +1/+1 counters into Mutagen tokens, which can not only become new +1/+1 counters but also have other utilities as artifacts
You can then use these new tokens to generate additional mana, and so on
Thats the balancing mechanism of many hybrid cards, including variants that still require one or more regular pips, like Jund Hackblade