Ariel, Priestess of the Nekroz (Rare)

Once per turn: You can reveal any number of "Nekroz" cards in your hand, increase or reduce this card's Level by the number of revealed cards until the end of this turn. If this card is Tributed by a card effect: You can add 1 "Nekroz" monster from your Deck to your hand, except a Ritual Monster. You can only use this effect of "Ariel, Priestess of the Nekroz" once per turn.