Can anyone ride ice dragons?
There are strict rules for riding regular dragons - one has to have a Targaryen blood. But in the latest episode we saw that Night King rode a dragon he converted into a wight without a problem. I'm wondering if any of the White Walkers can ride that dragon now, or only Night's King can ride it, or maybe Night's King had Targaryen blood when he was alive, which allows him to ride a dragon.
Could it be that when dragon died, regular magic connected to dragons disappeared, and anyone dead or alive can ride him now?