Memento Bone Back
If a face-up "Memento" monster(s) you control leaves the field because of an opponent's card: Special Summon 1 "Mementoral Tecuhtlica, the Netherskull Dragon" from your hand or Deck, ignoring its Summoning conditions. If your opponent moves a "Memento" monster(s) out of your GY while this card is in your GY (except during the Damage Step): You can banish this card; Special Summon as many "Memento" monsters as possible with different names from your hand and/or Deck. You can only use each effect of "Memento Bone Back" once per turn.