Its both protection and token generation in one package, letting you attack with confidence
Staying mono reduces your options but it greatly increases your consistency and any fighting you might have to do over fixing
Both Blue and Black excel at playing cards from the graveyard, meaning Nymris draws you cards to play now and cards to play later, all while encouraging you to play a lot of creatures with Flash and powerful Instants
Sure, you'll have to do just once per turn, but it's instants so you can do it on opposing turns too
Since the change, shes exploded in popularity as a Vampire commander, though part of that could be because an as-yet unmentioned card on this list is very expensive to buy
Single Combat is the gold standard: it leaves everyone with a single creature or planeswalker of their choice, but wipes out everything else and prevents anyone from casting creature spells for the next turn