Okay, its cool, but 7 mana
The only risk is having a colorless source in a three color deck means you could have some awkward draws, but thats not enough downside to avoid playing this
If everything on your board has Persist and Undying, they'll enter with no counters and you can sacrifice and bring them back ad infinitum
You usually only see this sort of mechanic on green cards, but since its colorless, it can function in all sorts of decks perhaps best in five-colors, where you need the extra mana ramp
What is unprecedented, at least within our data set that goes back to Return to Ravnica in fall 2012, is just how quickly things changed
I appreciate how this ability offers some semblance of wrath insulation