Criatura — Anjo
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Conforme Emissária de Serra entrar no campo de batalha, escolha um tipo de card.
Você e as criaturas que você controla têm proteção contra o tipo de card escolhido.
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.