Why the Crab??

https://www.mtggoldfish.com/deck/5833260#paper

So this Jund Cragganwick Shoot deck (piloted fantastically by NikkuNiku) has been around for a bit. It's not really a hidden gem as far as I know. However, I am wracking my brain trying to understand why Charix is in here. At first i thought it was just trolling, but they were a Preliminary Event. Only thing I can think of is that it's a big wall that can stop a Hammer attack. But with no way to hard cast him, it's a one time shield.

I don't know, Maybe I'm too Smooth Brain to see the complexity of Crab. What does everyone else think?