I for one actually think Nezahal is on par with Sphinx of the Final Word. Having a Mystic Remora attached to it is pretty great actually. It's a bit harder to protect from Swords since it doesn't have hexproof, but if your opponent needs to dig for that Swords he's in bad shape because you'll draw a lot. The great downside is that is has no evasion and that can hurt your clock a lot and make it impossible to race a Mentor.
Zacama seems good for the destroy artifact/enchantment ability, but it seems too pricey and Inferno Titan already takes care of most of the problems in Shops these days anyway.
The other 2 I don't see playing. Azor's abiltiy is too expensive and the cip trigger is just "kinda" useful. Zetalpa is just a big dumb beater so no.