Star-ik
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I think Amilu was the best newcomer in 2011.
Psih is, of course, great, but he's no longer a newcomer; he's an experienced player who delights fans with his excellent streams.
Crazy is also a great candidate for newcomer, but he's been playing for a long time and streams well too.
Maybe there are others, but it's very difficult to evaluate their gameplay just by reading reports.