Rules FAQ
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You can reveal a card "at random" even if it is the only card remaining in that player's hand. If no opponent has any cards in hand, Greyscale cannot be triggered. 
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If Sweetrobin is in play, he can remove the card you reveal with Greyscale from the game. However, Greyscale still resolves as normal. 
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A character can be saved from the kill effect of Greyscale. If that happens, you still have to attach Greyscale to a different character, if able. 
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You can trigger Greyscale even if it is attached to a character that cannot be killed. If you reveal a card with an equal or higher printed cost than attached character's, the kill effect does not resolve, but Greyscale still moves (if it can). 
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If attached character is killed successfully, Greyscale is attached to a different character (if there is one) before the terminal keyword would cause it to be discarded from play. 
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When Greyscale is attached to a different character, it never leaves play, so it remains knelt. 
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The "otherwise" part only happens if you reveal a card with lower printed cost. It does not happen if the kill effect is unsuccessful. 
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In a Melee game, you do not have to choose the opponent who controls attached character. You can choose any opponent. 
