(By far the most common problem is people mash shuffling without changing the top few cards of the deck.) And if you're a judge, please try to get into the habit of watching how people shuffle and nudging them if they need to improve
Yes, it is slightly more awkward to cast but you really should be able to fire it off before you have lost all 20 of your starting life
Creatures with the Myriad ability could be something to look at as well since Kamiz can make the original one unblockable
Null Profusion Limits your hand size and eliminates your draw step
In Commander, having diverse win conditions ensures that you can adapt to different board states and opponent strategies
With Dredge, this of course means fighting their graveyard, so a card like Anger of the Gods, while good, is rarely going to cripple your opponent