Ariel, Prêtresse des Nékroz MACR-FR031

Once per turn: you can reveal any number of "Nekroz" cards from your hand. Until the end of this turn, increase or decrease the Level of that card by the number of revealed cards. If this card is Tributed by a card effect: you can add 1 "Nekroz" monster (Ritual Monsters excluded) from your Deck to your hand. You can only use this effect of "Ariel, Priestess of the Nekroz" once per turn.