In case you hadn't noticed. There are tons of ways to get Child back in this deck. I've played Spideyjohn MANY times and child bomb goes off without a hitch Crypt Angel Beacon of Unrest (which you can use MANY times) Recollect Regrowth Primal Command
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Being someone who faces this deck on a regular basis all I can say is that it is solid. The lack of ramp is made up for by the use of naya charm, cheap creatures, and an easily adaptable color dependence spread. The colors are nicely spread between cards making it easy to work with if you don't run into a specific color soon enough. Also I would like to point out that while nacatl is good, it is by far inferior to yearlings and crashers in this deck. If this deck ran more ramp then I would agree with you that Nacatls should be put in it. However, this deck functions on the basis of control/aggro which takes out a need to accelerate that quickly. This deck also relies heavily on cascade, which I would much rather cascade into another haster than into something without haste. This deck is a perfect match up for Jund as it doesn't intend for creatures to stay out long and packs enough control to make attacks count. Destroy spells can't stop a good cascade attack and purges + paths + charms make a great defense without requiring much mana. Big naya decks can't deal with fast creatures early in the game either. If they can it's by using path and only results in this deck becoming even faster.
In a good way
Looking at this upsets me
Updated it