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When a spell or ability an opponent controls causes you to discard this card, if you control a Plains, create a 4/4 white Avatar creature token with flying

Although its unclear what exact function Roshan, Hidden Magister will have overall, it does seem to be particularly good in a disguise/morph build in an assassins deck so you can get assassin attacking triggers for those face-down creatures

The exhaust ability is really strong

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The Good Of all the face commanders, Y'shtola, Night's Blessed is my pick for the overall most powerful if properly built around: it's an absurd card draw engine and finisher and lifegain all rolled into one