I recently made a deck full of Monk Fighter, Master Monk, Chu-Ske The Mouse Fighter together with the respective spells they can use. Drop in an Aqua Chorus or 2 and you have a fun deck. Certeianly not OP but pretty fun.
I just looked at one of the crystal beast's card's text, and it says it is as a continuous spell card once it goes to the spell/trap zone, so I guess this means no. Would be good for Aqua Chorus if it does work. Right now, I'm afraid of it helping my opponent, but since it's a fun deck, I can't help including it because it's even better with Jesse's The Ties That Bind skill.