Aurelia's Fury

This question came up that needs an official answer. If my opponent casts Aurelia's Fury on my upkeep am I able to cast a spell using the bestow cost that turn? Thanks.
Cris Plyler

Yes, you can.

Checking whether a spell is legal to be cast (for “can cast” effects) is done before you start the process of casting the spell, so before you choose to pay the bestow alternate cost. At that point, it's still a creature spell.

Daniel Kitachewsky
L3, Paris, France
Rules NetRep