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.