I'm not sure of any other turn-based rpgs that do this but I know Breath of Fire IV does. Basically Toon1 casts water based (water spout) spell then immediately after Toon2 casts a wind spell (high winds). The water spell acts as a reagent to transform the wind spell, high winds, into something more powerful like Monsoon or Hurricane (something relevant to the spells combined). It needs to be done in sequence to combine and obviously other magic schools could be combined along with single-target and aoe spells. I've found combo's for physical attacks but I haven't been able to find anything like this for MV with spells. Is this possible for MV? If so, any ideas how to make it happen?