单卡释疑

• (2021-06-18 gpt)

  你可以选择任何牌张类别。一般的万智牌游戏中会出现的牌张类别包括神器、战役、生物、结界、瞬间、亲缘、地、鹏洛客和法术。超类别（例如雪境和基本）不能被选择。副类别（例如天使、灵气和树林）也不能被选择。

  You may choose any card type. The ones that may appear in a normal game of Magic are artifact, battle, creature, enchantment, instant, kindred, land, planeswalker, and sorcery. Supertypes such as snow and basic may not be chosen. Subtypes such as Angel, Aura, and Forest also may not be chosen.

• (2021-06-18 official)

  此处「选择牌张类别」这件事属于替代性效应，而非触发式异能。它不用到堆叠，且不能被回应。特别一提，如果你选择瞬间，对手不能试图在密使获得相应保护之前对它施放瞬间。

  The card type choice is a replacement effect, not a triggered ability. It doesn't use the stack and can't be responded to. Notably, if you choose instant, your opponent can't try to cast an instant on the Emissary before it has protection.