Why you should keep an eye on Euron Greyjoy in 'Game of Thrones' this season

The battle for the crown has been raging for years on Game of Thrones, but never with Euron Greyjoy. The current king of the Iron Islands (it's so hard to keep track!) has recently aligned himself with the Lannisters and turned on his own family — and he's just getting started.
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Let's recap for a moment who Euron even is. He's the younger brother of Balon Greyjoy, and the uncle of Yara and Theon. He killed his b