Possible solution to Azir and Rylai's is to make his soldiers autoattacks instead of spells
Yes, he could still do that with Frozen Mallet, but that's not an item he'd want stat-wise, right? And regarding Bork abuse - if you make it only apply onhits to first target, it becomes much less effective. Did you test that, Riot? You might want to give it a shot.

Coo coo modafaka