DeepSky, Aurora Dragon

Flying
When DeepSky, Aurora Dragon enters the battlefield, if you cast it from your hand, return all other creatures to their owners' hands.
{u}, Shuffle DeepSky, Aurora Dragon into its owner's library: Each player discards his or her hand, then draws cards equal to the greatest number of cards a player discarded this way.
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@DeepSky
https://mtgcardsmith.com/user/DeepSky