Persist means When this permanent is put into a graveyard from the battlefield, if it had no -1/-1 counters on it, return it to the battlefield under its owners control with a -1/-1 counter on it. Id like to point out that while the rules more vaguely state permanent and not creature, all of the cards that actively have the persist ability are creatures or grant it to creatures
Stufful (Mega Rising) is not available in Rare Packs
with no other way to obtain them
From that set, there is only one card that has more than two attributes (attacks, Pok-Powers, Pok-Bodies, or Abilities)
Freejam Regent has Flying and the new Improvise mechanic, which allows you to tap your artifacts to help pay for the casting cost, each artifact paying for one generic mana
Aside from being slightly more expensive to cast, the main difference between them and this card is that those cards trigger off of creatures entering the battlefield rather than being cast