Alsei, the Sylvan High Protector

LIGHTXyz/Effect Monster

2 Level 8 monsters // Once per turn: You can declare 1 card name; excavate the top card of your Deck, and if it is the declared card, add it to your hand. Otherwise, send it to the Graveyard. If a card is sent from your Deck to the Graveyard by a card effect (except during the Damage Step): You can detach 1 Xyz Material from this card, then target 1 card on the field; place that target on either the top or bottom of the Deck. You can only use this effect of "Alsei, the Sylvan High Protector" once per turn.