Puedes retirar del juego una carta blanca de tu mano en vez de pagar el coste de invocacion de las Cicatrices del veterano.

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You may remove a white card in your hand from the game rather than pay Scars of the Veteran’s mana cost.

Prevent the next 7 damage that would be dealt to target creature or player this turn. For each 1 damage to a creature prevented this way, put a +0/+1 counter on that creature at end of turn.