The sweet spot for walkers in Maverick seems to be at 4CMC, with Gideon, Ally of Zendikar and Vraska, Golgari Queen both having a great impact in the current meta game
When you have a powerful creature in your graveyard like Elesh Norn, Grand Cenobite in Commander, or Beza, the Bounding Spring in Standard, its worth gifting your opponents a card to get a powerful haymaker back
The real star of Persistent Constrictors show is the -1/-1 counter that it dishes out on each opponents upkeep
Picking up this card for under $1 used to be no trouble at all, and it rarely soared much beyond that
So, there's really no reason to think it would make it in Commander, right
Of course, the colors that dont have void get straight-up second spell this turn triggers instead