Rules FAQ
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A character with printed STR 1 or lower cannot be chosen for any effect that would cause it to leave play (including claim), nor can it be used to pay costs in a way that would cause it to leave play.
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When resolving the When Revealed ability of Valar Dohaeris or Wildfire Assault, you are not compelled to choose characters that cannot leave play. They will simply remain unaffected by the ability, even when not chosen.