Gush and Mind's Desire

[Eastman]

If Gush is removed from game by Mind's Desire,  am I limited to playing it without paying its mana cost?   Or,  if I have two islands may I choose to cast it paying the alternate cost and return them to my hand?   I've always assumed the former,  but the difference was relevant in playtesting tonight (had fastbond and needed the mana)  and I wasn't certain what was correct.

[fsecco]

You can't play alternative costs. Either you play without paying it's mana cost or you don't. Is the same reason why spells with X on their CC always have X = 0 under Desire.