Aug 2, 2016
Can I use Gisa and Geralf to cast Spiteful Returned from my graveyard for it's bestow cost?
No.
While Gisa and Geralf allow you to start casting Spiteful Returned from your graveyard, it will become illegally cast as soon as you choose to pay its bestow cost as it stops being a zombie. The game checks again around this point in the casting process to see if the proposed spell is legal, and will stop you from casting it. (You’ll return it to your graveyard and rewind the game to where you started to cast it. You can cast it or another zombie card from your graveyard still.)