The blitz assault Wave of Rats is the only new card to really sink its teeth into that blitz mechanic, and while you've already got blitz built into this card (no need for Henzie's additional ability there), being able to bring this onslaught back time and time again is going to prove useful when you're running a sacrifice-heavy deck like Riveteer Rampage
So a regular counterspell won't cut it, it will require something like a Disallow being used, but this will only deal with one half of the problem - either the body or the ability
Obviously extra utility is nice, and as mentioned, hard to evaluate in the context of this article
This will typically add to the board up front and then draw you a card, and it has long-term value engine potential
Once its been identified and graded, a collector can determine what their Squirtle Pokemon card is worth
Youre spending two mana to trigger Szarel and gain 2 life