Not to be underrated
The latter are used specifically during events like this, reducing the time needed to try out a battle again
While it offers incremental value with its ability to boost other creatures on entering the battlefield or dying, there are likely better cards available in those color combinations that offer more impactful effects for a similar mana cost, like [[Conclave Mentor]] or [[Basri's Lieutenant]]
So with Glistening Oil, you're giving an enemy creature Infect, staying safe from the poison counters yourself, all the while gaining life from having it on the field
The Problem with the Old New Fundamentally, we updated the contents of the new player offerings because the previous contents did not support the right goals or motivate desired behavior
There is always a chance for problems to arise when using a mod on a video game, so always utilize caution with any downloaded content