Troop fusion

I am just suggesting this idea, but could we have a new building that could combine two troop types( or more depending on its lvl)? The possibilities of troops it could combine could increase with its lvl? Spend de if you want to fuse one or two de troops and regular exiled if no de troops are being fused? Cost of fusion increases with the number of troops being fused? Building upgrade costs gold? I definitely do not want spells to be in this building, as some players might try to fuse troops and spells(OP). Please help me to elaborate on this idea!

Lol, Frankensteins castle, or, as Wilder would say, Fronkensteen.

Sounds interesting and I'll think on it.