The tools you have to play around Slaanesh's summoning are essentially the same you have to play around Kroak, namely murder all sources in a single turn based on what others are saying in this thread.
More in general though, Kroak, as well as the other various wizard mechanics that've been nerfed, weren't any less interactive than certain other mechanics that are allowed to remain. At least spellcasting has unbinds, it's one of the very few mechanics where an opponent can directly interfere in your turn.
And what I find funniest about all that is that the most broken wizard of all, who will keep on breaking every single interesting mechanic they can pull of with magic by sheer virtue of being such an outlier, hasn't recieved a single change to his immense casting powers.
In general they just seem to be inconsistent with magic and not really know where to go with it.