Ah, that sounds promising, thanks. Hope some more interesting Ground Energy ones come along too, the current ones don't really grab me.
My recollection is that we had indications fairly early on that there would be a full set of five beasts, one of each element, for each side. I don't recall any indications of any more beasts beyond them before Lavamuleta and Frost Saber were revealed. Do we know yet if there are going to be any more besides the grass bird? Seems like they'd at least want to have more stuff to release along with the bird to make a full wave.