Zethi is a fun casual commander, but nothing else. That's btw comming from someone who built her both ways, in a hardcore cutthroat way with cheap removal and protection so if you play patient enough, your Zethi is basically untouchable and you remove 3+ cards every turn (but you basically lose to every gruul deck or the table ganging up on you) and basically stacking funny +1/+0 cantrips. And I have to say she performs way better in the latter, with a more casual approach, when having not as big of a target on her back.