Rules FAQ
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Iron Emmett stops all card abilities that would put characters into play, as well as characters returning to play after being removed from the game (for instance, due to Mace Tyrell (R) or Coldhands). If a character that was removed from the game cannot return to play when its removal effect expires, that character stays removed from the game indefinitely.
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If you use Mace Tyrell (R) during the challenges phase, the character will return to play at the beginning of the dominance phase, so Iron Emmett will not prevent it from returning to play.
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Even if a character without the printed icon would immediately gain that icon while in play (for example, Rickon Stark while you control Shaggydog (WotN)), Iron Emmett does not stop such a character from entering play.