The only downside I see is that it deals damage based on its power rather than its toughness, but in return, you get to draw many cards based on the latter
It absolutely ravaged the Standard of its day, but hasnt had much Constructed success since the downswing of Robots/Affinity in Modern
Paper quality is another reliable indicator
Atarka, World RenderAtarka, World Render - 55,911 decks Much like Omnath, Atarka is a great commander option for players interested in a Dragon-typal deck but who would rather not dip into more colors for The Ur-DragonThe Ur-Dragon or TiamatTiamat

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Keep in mind which actions are once-per-turn and make sure you're committed to the idea before you take action