Wizard's new spells are to make old ones different or stronger i think the next spell cycle could be this in a minon a new minion for every school but, to add a new kind of twist to over all playing. These new minions can only be played when you sacrifice a weaker minion. For Example perhaps a seraph minion for life that requires you to sacrifice a sprite guardian to summon if your kind of catching what i'm getting at.
I think it would be cool to just add a bit to the game design of wizard spells that are powerful ,but require you to sacrifice a minion, plus because wizard gives most minion spells at a relatively low level they can become obsolete still good dont get me wrong i love my ice guardian but still just a stronger rank minion, and to make it a little more interesting you have to sacrifice a different minion