It allows two permanents to 'merge' into a bigger, more horrific entity, like Graf Rats and Midnight Scavengers melding to make Chittering Host
I mean dont get me wrong, I think the mechanic is a pretty big design mistake all in all, but if we have to look at some positive sides to it, it could be that it forces us to play to the table
Way back in the day, people used to play with a ton of those "artifact" cards -- you remember, Icy Manipulator, Winter Orb, Juggernaut, Mirror Universe -- even the five Mox brothers had a night at the opera
I also like this in the 99 of brews that play into Going Wide themes that include Black, like Orzhov Tokens while also pushing people's life total down with the swings
Oh, and we all absolutely love twirling a non-spindown d20 endlessly trying to find the next number up or down