Criatura — Humano Xamã Aliado
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Companheiro —

, Vire um Aliado desvirado que você controla: Descarte um card. Se fizer isso, compre um card.
Discarding a card is part of the ability’s effect and isn’t optional. As the cohort ability resolves, if you have a card in your hand, you must discard one, even if the card you may have wanted to discard as you activated the ability is no longer in your hand.