[BOSH] Youtou - Shiranui

If this card is in your Graveyard, except the turn it was sent to the Graveyard: You can target 1 non-Tuner Zombie-Type monster in your Graveyard; banish both it and this card, and if you do, Special Summon 1 Zombie-Type Synchro Monster from your Extra Deck whose Level equals the total Levels of the banished monsters. You can only use this effect of "Youtou - Shiranui" once per turn.