Persist and undying

[Yawgmoth85]

If a creature with persist is sac'd and is given undying would the creature come back and the counters cancel eachother out? I'm building a {mikaeus the unhallowed} EDH deck and trying to do some research

[Wally]

The trick is to use one, then the other.

As the effect from both is to return a creature from the graveyard to the battlefield with a counter on it, it won't be there for the second effect to take place.

[Yawgmoth85]

So I choose which effect takes place undying or persist sac the choose other effect?

[Wally]

Yep! It's a never ending cycle if you have a good sac outlet.
Undying first time, persist second, undying third, etc.