Beginning of Upkeep order

[Volrath, the Fallen]

Say I have a Panoptic Mirror with Threaten imprinted on it in play plus a Greater Harvester. Can I throw the Greater Harvester's ability on the stack so that I can first steal my opponent's monster and then sacrifice it for my Greater Harvester?

[The Legends]

Yes. Since you control both triggers (Panoptic Mirror and Greater Harvester), you stack them in any order you want.

*Extra* Grab the Reins will give you a similar effect with added flexibility. You could chose either portion of the Grab when playing it, or play the entwine cost when playing the copy and have all sorts of steal-and-kill fun

[Butcher Orgg(s)]

Hey, the Legends, did you actually get that booster in your picture?

[Maraxus of Keld]

Nah, we just found the pic online (The Legends is a group name we use for answering questions and sometimes for making announcements).