[Valerius]

The only possible problem I encountered when testing it was that if there are more than two attempts to summon earth or fire kings or more than three attempts to summon water or air queens in a given turn only two of the attempts to summon fire/earth kings and only three of the attempts to summon water/air queens will succeed. I don't see it as a problem; it could just be viewed as a risk of that particular class of summons. BTW, I'd also be inclined to give the elemental royalty a bit of a boost in HP (especially air and fire).