Fury of the Hord instant speed

[Antirayman]

What happens, when i cast  {Fury of the Horde} during my opponents upkeep with  {Hypersonic Dragon} or {Vedalken Orrery}?

[Wackaman9001]

They get another combat phase and another main phase. Fury doesn't say YOU get another phase, only that there is another

[Antirayman]

Ok, but on fury of the hord is written after this main phase. Between which phased is the additional combat phase actually placed?

[Wackaman9001]

So after combat you go in to the 2nd main. You cast the spell. After that main and before end step, there is another combat, and then another main

[Antirayman]

... My question is what happens if i cast the spell in my opponents upkeep.

[scarsabrex]

It only untaps all creatures.

RESOLVED

[Double-O-Scotch]

It only untaps creatures if they attacked. No go.

[scarsabrex]

It only untaps creatures if they attacked. No go.

Well yeah. So if you manage to cast it during an upkeep nothing happens.

[Keyeto]

Just to make sure this is clear (and I'm only posting this since there were multiple answers of mixed opinion). As the ruling on Gatherer states:

7/15/2006 If it's somehow not a main phase when Fury of the Horde resolves, all it does is untap all creatures that attacked that turn. No new phases are created.